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2D 2-Dimensional 3D 3-Dimensional 3M Minnesota Mining and Manufacturing 4GL Fourth Generation Language 4H Head, Heart, Hands, Health 4WD Four wheel Drive (see also FWD) A Aftermath AA Affirmative Action committee AA Alcoholics Anonymous AA Antiaircraft Artillery AA Associate in Accounting A&A Astronomy and Astrophysics [Space] AA Automobile Association [England] AAA American Automobile Association AAAL American Academy of Arts and Letters AAAS American Association for the Advancement of Science AAII American Association of Individual Investors AAMSI American Association for Medical Systems Informatics AAO Anglo-Australian Observatory [Space] AAP Affirmative Action Program AARC Anglo-American Cataloging Rules AARN Australian Academic Research Network [Networking] AARP American Association of Retired Persons AAS American Astronomical Society [Space] AAVSO American Association of Variable Star Observers [Space] AB ABle seaman ABA American Bar Association ABA American Basketball Association ABA American Booksellers Association ABBR ABBReviation ABC American Broadcasting Company [Corporate name] AC Alternating Current (ac, see also DC) AC Ante Christum (before Christ) AC Ante Cibum (before meals) ACAA Agricultural Conservation and Adjustment Administration ACAWS Advisory, Caution, And Warning System ACBL American Contract Bridge League ACC Argonne Code Center ACCS Army Command and Control System ACD Automatic Call Distributor [Telephony] ACE Advanced Composition Explorer [Space] ACE Advanced Computing Environments [Corporate name] ACE Automatic Calibration and Equalization ACHEFT Automated ClearingHouse Electronic Funds Transfer ACK ACKnowledge ACL Advanced Cmos Logic ACLU American Civil Liberties Union ACM Association for Computing Machinery ACRV Assured Crew Return Vehicle (or) Astronaut Crew Rescue Vehicle [Space] ACS Advanced Communications System ACSE Association Control Service Entity (ISO/CCITT layer 7) ACT Action for Children's Television (in Cambridge, MA) ACT American Conservatory Theater ACTS Advanced Communications Technology Satellite ACTS Automatic Coin Telephone Service [Telephony] ACU Alarm Control Unit ACU Automatic Call Unit [Telephony] ACW Alternating Continuous Waves AD After Date A/D Analog to Digital converter (see ADC) AD Anno Domini (in the year of our Lord) AD Application Development Ad Astra To the stars [Latin, Space] ADAP Alzheimer's disease-associated protein ADAP American Discount Auto Parts [Corporate name] ADB A DeBugger ADB Apple Desktop Bus ADC Analog to Digital Converter ADCI Automatic Display Call Indicator AD&D Advanced Dungeons & Dragons ADF Automatic Direction Finder ADM ADMiral ADP Adenosine Di-Phosphate ADP Administrative Data Processing ADP Advanced Data Processing ADPCM Pulse Code Modulation with Adaptive Quantization ADS Application Development System ADSR Attack Decay Sustain Release ADT Abstract Data Type ADT Atlantic Daylight Time AE Application Execution AEA American Electronics Association AEC Atomic Energy Commission AEF American Expeditionary Force (see BEF) AEGIS Advanced Electronic Guidance and Instrumentation System AF Adventures in Fantasy AF Air Force AF Audio Frequency AFADS Automatic Force Adjustment Data System AFATDS Advanced Field Artillery Tactical Data System AFB Air Force Base AFC American Football Conference AFC Automatic Flight Control AFC Automatic Frequency Control AFCAC Air Force Computer Acquisition Center AFCC Air Force Communications Command AFGE American Federation of Government Employees AFIPS American Federation of Information Processing Societies AFL American Federation of Labor AFL American Football League AFLCIO American Federation of Labor and Congress of Industrial Organizations AFNOR Association Francaise de NORmalization AFP Appletalk Filing Protocol AFS Andrew File System AFSC Air Force Systems Command AFSCME American Federation of State, County and Municipal Employees AFTRA American Federation of Television and Radio Artists AG Adjutant General AG Arcade Game AG Attorney General AGCT Army General Classification Test AGN Active Galactic Nucleus [Space] AHL American Hockey League AHQ Air HeadQuarters AI Artificial Intelligence AIAA American Institute of Aeronautics and Astronautics [Space] AIC Automatic Intercept Center AID Agency for International Development AIDDE Ames' Interactive Dynamic Display Editor AIDS Acquired ImmunoDeficiency Syndrome AIOD Automatic Identification Outward Dialing AIS Automatic Intercept System AIX Advanced Interactive eXecutive (IBM's name for UNIX) AJ Astronomical Journal [Space] AK Alaska AKA Also Known As AL Alabama [US state postal designation] AL American League (baseball) ALA American Library Association ALA Automobile Legal Association ALBM Air-to-Land Ballistic Missile ALC Automatic Load Control ALGOL ALGOrithmic Language ALIT Automatic Line Insulation Testing [Telephony] ALPO Association of Lunar and Planetary Observers [Space] ALS Advanced Launch System [Space] ALU Arithmetic Logic Unit A&M Agricultural and Mechanical AM Amplitude Modulation AM Ante Meridiem (before noon) AMA American Medical Association AMA Automatic Message Accounting [Telephony] AMARC Automatic Message Accounting Recording Center AMBA Association of Master of Business Administration AMC Albany Medical College AMC American Motors Corporation(?) [Corporate name] AMC Appalachian Mountain Club AMD Advanced Micro Devices [Corporate name] AMEX AMerican EXpress [Corporate name] AMI Alternate Mark Inversion (see also NRZ, NRZI, B8ZS) AMORC Ancient Mystic Order Rosae Crucis AMP Adenosine MonoPhosphate AMPAS Academy of Motion Picture Arts and Sciences AMPAS Acedemy of Motion Picture Arts and Sciences AMRAAM Advanced Medium Range Air-To-Air Missile AMROC American Rocket Company [Space] AMSAT radio AMateur SATellite corp. AMU Atomic Mass Unit AMVET AMerican VETeran ANA American Nurses Association ANAC Automatic Number Announcemnt Circuit [Telephony] ANC All Number Calling [Telephony] ANC Army Nurse Corps ANDF Architecture-Neural Distribution Format ANF Automatic Number Forwarding [Telephony] ANG Air National Guard ANI Automatic Number Identification (see also: CLID) [Telephony] ANL Argonne National Laboratory ANOVA ANalysis Of VAriance ANPA American Newspaper Publishers Association ANSI American National Standards Institute ANZUS Australia, New Zealand, United States AO Account Of AOA Abort Once Around [NASA, Shuttle] AOA Abort Once Around (Shuttle abort plan) [Space] AOL Absent Over Leave (see AWOL) AOS Academic Operating System AOS Alternate Operator Service [Telephony] A/P Accounts Payable AP Additional Premium AP All Points AP Associated Press [Corporate name] APA All Points Addressable APA American Psychological Association APB All Points Bulletin APDA Apple Programmers and Developers Association API Application Programming Interface APICS American Production and Inventory Control Society Ap.J Astrophysical Journal [Space] APL A Programming Language APL acute promyelocytic leukemia [Disease] APO Alpha Phi Omega, service fraternity APO Army Post Office APP Applications Portability Profile APPC Advanced Peer-to-Peer Communications APR Annual Percentage Rate (as in loan interest) APSE Ada Programming Support Environment APU Auxiliary Power Unit [Space] AQ Accumulator-Quotient register A/R Accounts Receivable AR Address Register AR Arkansas ARC AIDS-related complex ARC American Red Cross ARC Ames Research Center (NASA) [Space] ARCNET Attached Resource Computer local area NETwork ARO After Receipt of Order ARP Address Resolution Protocol ARPA Advanced Research Projects Agency (of the DoD, see DARPA) ARPANET ARPA (q.v.) NETwork ARRL Amateur Radio Relay League ARV American Revised Version AS Anglo-Saxon ASA Acetyl Salicylic Acid ASAP As Soon As Possible ASC Accredited Standards Committee ASCAP American Society of Composers, Authors, and Publishers ASCC Automatic Sequence-Controlled Calculator ASCII American Standard Code for Information Interchange ASDIC Anti-Submarine Detection Investigation Committee (British for sonar) ASDSP Application-Specific Digital Signal Processor ASG Automated Sciences Group ASHRAE Amer. Soc. of Heating, Refrigerating and Air-cond. Engineers, inc. ASIC Application Specific Integrated Circuit ASME American Society of Mechanical Engineers ASN Abstract Syntax Notation One (ISO/CCITT ASN.1) ASP Aggregated Switch Procurement ASRM Advanced Solid Rocket Motor [Space] ASSR Autonomous Soviet Socialist Republic AST Atlantic Standard Time ASV American Standard Version AT Atlantic Time ATA Automatic Trouble Analysis ATACC Advanced Tactical Air Command Central ATB Advanced Technology Bomber (stealth bomber) ATC Air Traffic Control ATDRS Advanced Tracking and Data Relay Satellite [Space] ATF Advanced Technology Fighter ATIS Atherton Tools Interface Specification ATLAS Atmospheric Laboratory for Applications and Science [Space] ATM Amateur Telescope Maker [Space] ATM Asynchronous Transfer Mode ATM Automatic Teller Machine ATO Abort To Orbit [NASA, Shuttle] ATO Abort To Orbit (Shuttle abort plan) [Space] ATOMS AT&t Optimized Materials Simulator ATP Adenosine TriPhosphate ATPCO Airline Tariff Publishing COmpany AT&T American Telephone & Telegraph [Corporate name] ATT American Telephone & Telegraph (normally written AT&T when seperate) ATTIS American Telephone and Telegraph Information Systems [AT&T] (Division) ATV All Terrain Vehicle AU Astronomical Unit (93,000,000 miles) [Space] AU Astronomical Unit [Space] AUI Attachment Universal Interface AURA Association of Universities for Research in Astronomy [Space] AUS Army of the United States AUTODIN AUTOmatic DIgital Network AUTOVON AUTOmatic VOice Network AV AudioVisual AVLIS Atomic Vapor Laser Isotope Separation AWACS Airborne Warnings And Control Systems AWEA American Wind Energy Association AWK al Aho, peter Weinberger, brian Kernighan (pattern scanning language) AWOL Absent WithOut Leave (also Absent Without Official Leave) (see AOL) AW&ST Aviation Week and Space Technology (a.k.a. AvLeak) [Space] AXAF Advanced X-ray Astrophysics Facility [Space] AZ Arizona B Book B8ZS Binary 8 Zero Substitution (see also NRZ, NRZI, AMI) BA Bachelor of Arts BACH Business Alliance for Commerce in Hemp BAFO Best And Final Offer BARRNet Bay Area Regional Research Network (SF Bay Area) BASIC Beginner's All-purpose Symbolic Instruction Code BATSE Burst And Transient Source Experiment (on GRO) [Space] BB Bases on Balls BB Best of Breed BB Bunnies and Burrows BBA Bachelor of Business Administration BBB Better Business Bureau BBC British Broadcasting Corporation BBL Barrel BBN Bolt, Beranek, and Newman, Inc. [Corporate name] BBXRT Broad-Band X-Ray Telescope (ASTRO package) [Space] BC Battlecars BC Before Christ BC British Columbia BC/BS Blue Cross/Blue Shield BCD Bad Conduct Discharge BCD Binary Coded Decimal BCDIC Binary Coded Decimal Interchange Code BCE Before the Common Era (substitute for BC) BCNU Be Seeing You [Net jargon] BCP Byte Controlled Protocols BCPL Basic Combined Programming Language BCS Bachelor of Commercial Science BCS Binary Compatibility Standard BCS Boston Computer Society BCS British Computer Society BD Bachelor of Divinity BD Bank Draft BD Bills Discounted BD&D Basic Dungeons & Dragons BDF Binary Distribution Format BDT Billing Data Transmitter BE Bill of Exchange BEF British Expeditionary Force (see AEF) BELCORE BELL COmmunications REsearch BEM Bug Eyed Monster BEM Bug-Eyed Monster [Space] BENELUX BElgium, NEtherlands, and LUXembourg BER Bit Error Rate BERT Bit Error Rate Test BEST Borland Enhanced Support and Training BF Brought Forward BFA Bachelor of Fine Arts BFD Bristol (RI) Fire Department (probably typical of any town starting "B") BH Black Hole [Space] BH Boot Hill BHP Brake HorsePower BICS Building Industry Consulting Services [Telephony] BID Bis In Die (twice a day) BIMA Berkeley Illinois Maryland Array [Space] BIOS Basic Input Output System BIS Business Information System BISDN Broadband ISDN (q.v.) [Telephony] BiSync Binary Synchronous Communications (BSC is preferred) [IBM] Bit BInary digiT BITNET Because It's Time Network BLAST BLocked ASynchronous Transmission BLERT BLock Error Rate Test BLF Busy Lamp Field [Telephony] BLT Bacon, Lettuce, and Tomato (sandwich) BLT BLock Transfer [Instruction] BLT Branch Less Than [Instruction] BM Basal Metabolism BM Bowel Movement BMA Bank Marketing Association BMEWS Ballistic Missile Early Warning BMO Ballistic Missile Office BMOC Big Man On Campus BMR Basal Metabolism Rate BNC Bayonet Neill Concelman (connector) [Electronics] (see also TNC) BNF Bachus-Naur Form BO Body Odor BO Branch Office BO Buyer's Option BOC Bell Operating Company BOD Board Of Directors BOF Birds Of a Feather BOM Bill Of Materials BOOTP Bootstrap Protocol [Internet] BOQ Bachelor Officers' Quarters BOS Business Office Supervisor BOSIX Biin Open System Interface eXtension BP Blood Pressure BP British Petroleum BP British Pharmacopoeia BPI Bits Per Inch BPL Boston Public Library BPL Branch if PLus [Instruction] BPOE Benevolent and Protective Order of Elks BPS Bits Per Second BR Bills Receivable BR British Rail BRA Boston Redevelopment Authority BRI Basic Rate Interface (ISDN) [Telephony] BRIEF Basic Reconfigurable Interactive Editing Facility BRL army Ballistic Research Laboratory BRS Bibliographic Retrieval Service BS Bachelor of Science BS Bill of Sale BSA Birmingham Small Arms BSA Boy Scouts of America BSc Bachelor of SCience BSC Binary Synchronous Communications (also sometimes BiSync) [IBM] BSD Berkeley Software Distribution BSN Bachelor of Science in Nursing BSS Block Started by Symbol BSTJ Bell System Technical Journal BT British Telecom BTAM Basic Telecommunications Access Method [IBM] BThU British Thermal Unit (BTU {q.v.} is preferred) BTL Bell Telephone Laboratories BTO Bachman Turner Overdrive BTU British Thermal Unit BTW By The Way [Net jargon] BU Boston University BUF B-52 bomber ("Big Ugly Fellow") [USAF] BV Blessed Virgin BWI Baltimore-Washington International (airport) BWI British West Indies BX Base eXchange (see also PX) c centi- (metric 1/100) C programming language (successor to B, which was based on BCPL) CA California CA Chartered Accountant CA Chief Accountant CA Chronological Age CA Collision Avoidance (as in CSMA/CA (q.v.)) CAB Civil Aeronautics Board CACM Communications of the Association for Computing Machinery CAD Computer Aided Design (sometimes seen as CAD/CAM) CAD Computer Aided Dispatching CAE Common Applications Environment CAE Computer Aided Engineering CAI Computer Aided Instruction CAIS Common Apse Interface Specification CALS Computer-aided Acquisition and Logistics Support CAM Computer Aided Management CAM Computer Aided Manufacturing (sometimes seen as CAD/CAM) CAM Content Addressable Memory CAMA Centralized Automatic Message Accounting [Telephony] CAMP Campaign Against Marijuana Planting CAP Civil Air Patrol CAP Columbia Appletalk Package CAR Contents of the Address part of the Register (LISP) CARE Committee on American Relief in Europe CARP California Air Resources Board CASE Computer Aided Software Engineering CASSIS Classification and Search Support Information System CAT Computer-Aided Tomography CATIS Common Applications and Tools Integration Services CATV Common Antenna TeleVision CATV Community Antenna TeleVision CAVU Ceiling And Visibility Unlimited CB Citizens Band radio CBC Canadian Broadcasting Corporation CBD Cash Before Delivery CBD Commerce Business Daily CBEMA Computer & Business Equipment Manufacturers Association CBR Chemical, Biological, Radiological warfare CBS Columbia Broadcasting System [Corporate name] CBW Chemical and Biological Warfare CC C (language) Compiler CC Carbon Copy CCA Computer Corporation of America [Corporate name] CCAFS Cape Canaveral Air Force Station [Space] CCC Canadian Committee on Cataloging CCC Civil(ian) Conservation Corps CCC Command, Control, and Communications (sometimes C^3) CCC Concourse Computer Center [MIT] CCCCM CCC CounterMeasures (sometimes C^3CM) CCCI Command, Control, Communications, and Intelligence CCD Charge Coupled Device (see CID) CCD Charge-Coupled Device [Space] CCDS Centers for the Commercial Development of Space [Space] CCF Hundred Cubic Feet CCI Computer Carrier Interrupt CCI Computer Consoles, Incorporated CCIP Continuously Computed Impact Point CCIRN Coordinating Committee for Intercontinental Research Networking CCIS Common Channel Interoffice Signaling [Telephony] CCITT Comite' Consultatif International Telegraphique et Telephonique CCITT Consultative Committee on International Telephony and Telegraphy CCITT International Telegraph and Telephone Consultative Committee CCR Commitment, Concurrency, and Recovery CCR Creedence Clearwater Revival [Music] CCRI Community College of Rhode Island [Corporate name] CCRP Continuously Computed Release Point CCS Hundred Call Seconds [Telephony] CCS7 Common Channel Signalling (version #7) [Telephony, AT&T] CCSA Common Control Switching Arrangement [Telephony] CCTA Central Computer and Telecommunications Agency CCTV Closed Circuit TeleVision CD Carrier Detect (properly DCD (q.v.)) (EIA RS-232-C) CD Certificate of Deposit CD Civil Defense CD Collision Detection (as in CSMA/CD (q.v.)) CD Compact Disk CDA Call Data Accumulator CDA Compound Documents Architecture CDC Centers for Disease Control CDC Control Data Corporation, Inc. [Corporate name] CDEV Control panel DEVice CDIAC Carbon Dioxide Information Analysis Center CDO Community Dial Office CDR CommanDeR CDR Contents of the Decrement part of the Register (LISP) CD-ROM Compact Disk Read Only Memory CD-ROM Compact Disk Read-Only Memory [Space] CDSF Commercially Developed Space Facility CDT Central Daylight Time CDU Control Display Unit CE Chemical Engineer CE Civil Engineer CE Common Era (substitute for AD) CE Corps of Engineers CE Customer Engineer (see also FE, SE) CEA Commissariat a l'Energie Atomique (Frenc Atomic Energy Commision) CEA Council of Economic Advisors CEA County Education Authority CEC Commission of the European Communities CED Committee for Economic Development CELSS Controlled Ecological Life Support System [Space] CENS Centre d'Etudes Nucleaires de Seclay CENTO CENtral Treaty Organization CEO Chief Executive Officer CERFnet California Education and Research Federation Network CERN European Organization for Nuclear Research CERN organisation (formerly Conseil) Europeenne pour la Recherche Nucleaires CERT Computer Emergency Response Team CEVI Common Equipment Voltage Indicator CF Carry Forward CF Coin First (payphone) [Telephony] CF Cystic Fibrosis [Disease] CFA Center For Astrophysics [Space] CFC Chloro-FluoroCarbon [Chemical] CFC Combined Federal Campaign CFD Computational Fluid Dynamics CFHT Canada-France-Hawaii Telescope [Space] CFI Cost, Freight, and Insurance CFL Canadian Football League CFO Chief Financial Officer CG Coast Guard CG Commanding General CGA Color Graphics Adapter CGCT Compagnie Generale de Constructions Telephoniques CG&E Cincinnati Gas & Electric CGE Compagnie Generale d'Electricite CH Cardboard Heroes CH ClearingHouse CH CourtHouse CH Customs House CHA Champions CHAP CHAnnel Processor CHARA Center for High Angular Resolution Astronomy [Space] CHI Chill: Adventures into the Unknown CHOTS Corporate Headquarters Office Technology System CHP California Highway Patrol CI Cubic Inches CIA Central Intelligence Agency [US Government] CIA Culinary Institute of America (Hyde Park, NY) CIC Carrier Identification Codes [Telephony] (10XXX codes) CIC Committee on Institutional Cooperation CIC Coordination and Information Center [CSNet] CICA Competition in Contracting Act CICS Customer Information Control System [IBM] CID Caller ID [Telephony] (see also: CLID, ANI) CID Central Institute for the Deaf CID Charge Injection Device (see CCD) CID Computer Integrated Design CIDIN Common Icao Data Interchange Network CIM Computer Integrated Manufacturing CIO Chief Information Officer CIRRIS Cryogenic InfraRed Radiance Instrument for Shuttle [Space] CISC Complex Instruction Set Computer Cislunar The space between the Earth and the Moon CIT California Institute of Technology CIT Case Institute of Technology (part of CWRU, Cleveland, OH) CIT Circumstellar Imaging Telescope [Space] CLASP Comprehensive Logistics Automated Support Program CLASS Custom Local Area Signaling Service [Telephony] CLI Command Line Interpreter CLID Calling Line ID [Telephony] (see also: CID, ANI) CLNP Connectionless-mode Network Protocol CLNS Connectionless-mode Network Service CLR Combined Line and Recording CLRC Circuit Layout Record Card CLU Chartered Life Underwriter CLUT Color LookUp Table cm centimeters CM Command Module (Apollo spacecraft) [Space] CM Congregation of the Mission CMC Communication Machinery Corp. CMD Centralized Message Distribution CMIP Common Management Information Protocol CMIS Common Management Information Services CML Current Model Logic CMMU Cache/Memory Management Unit CMOS Complementary Metal Oxide Semiconductor (see MOS) CMOT Common Management Information Services and Protocol Over TCP/IP CMRR Common Mode Rejection Ratio CMS Circuit Maintenance System CMSgt Chief Master Sergeant CMU Carnegie-Mellon University CMYK Cyan, Magenta, Yellow, blacK CN Canadian National [Corporate name, Railroading] CN/A Customer Name / Address [Telephony] CNI Common Network Interface [Telephony, AT&T] (Department of AT&T) CNN Cable News Network CNO Carbon-Nitrogen-Oxygen [Space] CNO Chief of Naval Operations CNR Canadian National Railways CNR Carrier to Noise Ratio CNRI Corporation for National Research Initiatives CNRS Centre National de la Recherche Scientifique (French National Center for Scientific Research) CNS Central Nervous System CNSR Comet Nucleus Sample Return [Space] CO Cash Order CO Central Office [Telephony] CO Colorado CO Commanding Officer CO Conscientious Objector C/O in Care Of COB Close Of Business COBE COsmic Background Explorer [Space] COBOL COmmon Business Oriented Language COC Call of Cthulhu COCOT Customer Owned, Coin Operated Telephone [Telephony] COD Collect On Delivery; Cash On Delivery CODEC COder-DECoder COER Central Office Equipment Report COLA Cost-Of-Living Allowance COM Computer Output (on) Microfiche COM Computer Output (on) Microfilm COMAS Central Office Maintenance and Administration System COMM Communications COMPACT COMmercial Product ACquisition Team COMPTEL COMPton TELescope (on GRO) [Space] COMSAT Communications Satellite [Space] CONACYT Consejo Nacional de Cienca Y Tecnologia (Mexican National Council of Science and Technology) CONS Connection-Oriented Networking Service CONS Connection-Oriented Networking Session CONS CONStruct (LISP) CORE COntrolled Requirement Expression CORN COmputer Resource Nucleus COS Corporation for Open Systems COSINE Cooperation for Open Systems Interconnection Networking in Europe COSMIC COmmon System Main InterConnecting frame COSMIC COmputer Software Management and Information Center COSMOS COmputer System for Mainframe OperationS COSTAR Corrective Optics Space Telescope Axial Replacement [Space] COT Card Or Tape (NCR) CP Campus Police (MIT, others probably too) CP Canadian Pacific CP Chemically Pure CP Command Post CP Command Processor CP CoPy CP the Canadian Press CPA Certified Public Accountant CPE Customer Premises Equipment CPE Customer Provided Equipment CPFF Cost Plus Fixed Fee CPI Characters Per Inch CPI Common Programming Interface CPL Combined Programming Language CPM Control Program for Microcomputers (sometimes CP/M) CPM Control Program Monitor (sometimes CP/M) CPO Chief Petty Officer CPO Chief Post Office CPR Canadian Pacific Railway CPS Characters Per Second CPSR Computer Professionals for Social Responsibility CPT CaPTain CPU Central Processing Unit CPW Certified Public Weigher CQ Change of Quarters CR Carriage Return (ASCII 15 octal) CRA Cambridge Redevelopment Authority CRAF Comet Rendezvous / Asteroid Flyby [Space] CRAM Card Random Access Memory (NCR, but maybe others) CRC Chemical Rubber Company CRC Cyclic Redundancy Check CREG Concentrated Range Extension with Gain CREN The Corporation for Research and Educational Networking (merge of BITNET and CSNet) CRRES Combined Release / Radiation Effects Satellite [Space] CRRES Combined Release and Radiation Effects Satellite [NASA] CRT Cathode Ray Tube (also generic reference to a terminal) CRTC Canadian Radio-television and Telecommunications Commission C&S Chivalry & Sorcery CS Civil Servant CS Computer Science; Computing Science CS County Seat CSA Confederate States of America CSAB Computing Sciences Accreditation Board CSACS Centralized Status, Alarm and Control System CSC Computer Sciences Corporation CSDC Circuit Switched Digital Capability CSF Critical Success Factor CSI Commercial Systems Integration CSIS Canadian Security and Intelligence Service CSL Coin Supervising Link CSM Command and Service Module (Apollo spacecraft) [Space] CSM Command Sergeant Major CSMA Carrier Sense Multiple Access CSMA/CA Carrier Sense Multiple Access with Collision Avoidance CSMA/CD Carrier Sense Multiple Access with Collision Detection CSNET Computer + Science Network (merged with BITNET to make CREN) CSO Central Services Organization CSOC Consolidated Space Operations Center (at Colorado Springs) CSP Control Switching Point CSR Control and Status Register CSR Customer Service Representative [Telephony] CSRG Computer Systems Research Group CSRS civil Service Retirement System CSS Customer Switching System CST Central Standard Time CSU Channel Service Unit CT Central Time C&T Communications & Tracking [Space] CT Connecticut CTC Canadian Transport Commission CTC Centralized Traffic Control [Railroading] CTD Computing and Telecommunications Division CTIO Cerro Tololo Inter-american Observatory CTIO Cerro Tololo Interamerican Observatory [Space] CTNE Compania Telefonica Nacional de Espana CTS Clear To Send (EIA RS-232-C) CTS Compatible Timesharing System CTV Canadian TeleVision network CU Close-Up CUA Common User Access CUL See You Later [Net jargon] CV Curriculum Vitae CW Car Wars CW Chemical Warfare CW Child Welfare CW Churchwarden CW Churdwarden CW Continuous Wave CWO Cash With Order CWO Chief Warrant Officer CWRU Case Western Reserve University CXI Common X-windows Interface CY Calendar Year CYO Catholic Youth Organization CZ Canal Zone D Depth DA Days after Acceptance DA Department of Agriculture DA Deposit Account D/A Digital to Analog converter DA Directory Assistance (/C = computerized, /M = Microfilm) [Telephony] DA District Attorney DA Don't Answer [Telephony] (may be more general) DAC Digital to Analog Converter DA/C Directory Assistance/Computerized DACCS Digital Access Cross Connect System [Telephony] (suspect, see DACS) DACS Digital Access Cross-connect System [Telephony] DAD Draft ADdendum DAG Directed Acyclic Graph DAL Dedicated Access Line [Telephony] DA/M Directory Assistance/Microfilm DAP Division Advisory Panel (of NSF (q.v.) DNCRI (q.v.)) DAR Daughters of the American Revolution DARE Drug Abuse Resistance Education DARPA Defense Advanced Research Projects Agency (of the DoD, see also ARPA) DASD Direct Access Storage Device DAT Digital Audio Tape DATA Defense Air Transport Administration DAV Disabled American Veterans DB DataBase db decibel(s) dba doing business as DBF DBase Format DBME DataBase Managment Environment dbms DataBase Management System (rdbms for Relational ...) DBRAD Data Base Relational Application Directory DC Direct Current (dc, see also AC) DC District of Columbia DCA Defense Communications Agency DCA Distributed Communication Architecture DCA Document Content Architecture DCC Descriptive Cataloging Committee DCCO Defense Commercial Communications Office DCD Data Carrier Detect (sometimes CD (q.v.)) (EIA RS-232-C) DCE Data Communication Equipment DCL Digital Command Language DCP Distributed Communications Processor DCTS Dimension Custom Telephone Service DD Daredevils DD Data Dictionary DD Days after Date DD Demand Draft DD Dishonorable Discharge DD Disk Drive DD Doctor of Divinity D&D Dungeons & Dragons DDC Digital Data Converter DDCU DC-to-DC Converter Unit [Space] DDD Direct Distance Dialing [Telephony] (principally US, elsewhere STD) DDL Document Description Language DDN Defense Data Network DDP Distributed Data Processing DDS Dataphone Digital Service [AT&T] DDS Digital Data Service DDS Direct Digital Service DDS Doctor of Dental Science DDS Doctor of Dental Surgery DDT DEC Debugging Tape DDT Di-<something> (pesticide) DDT Dynamic Debugging Technique DE Delaware DEA Drug Enforcement Agency [US Government] DEAR Department of Energy Acquisition Regulation DEC Digital Equipment Corporation [Corporate name] DECUS Digital Equipment Corporation Users Society DES Data Encryption Standard [NIST] DEW Distant Early Warning (as in DEW Line) DF Damage Free D/F Direction Finding DFC Distinguished Flying Cross DFD Data Flow Diagram DFE Data Flow Editor DFM Distinguished Flying Medal DFN Deutsche Forschungsnetz Verein (German Research Network Association) DFRF Dryden Flight Research Facility [Space] DFS Depth-First Search DFW Dallas-Ft.Worth (regional airport) DG Data General [Corporate name] DG Dei Gratia (by the grace of God) DG Director General DGSC Defense General Supply Center DHHS Department of Health and Human Services DHSS british Department of Health and Social Security DHSS Department of Health and Social Security (British) DIA Document Interchange Architecture DIAD (magnetic) Drum Information Assembler / Dispatcher DIAL Direct Information Access Line DIAS Defense Automatic Integrated System DID Direct Inward Dialing [Telephony] DIF Document Interchange Format DIN Deutsches Institut fur Normung DIRE Dire Is Really Emacs DIS Draft International Standard [ISO] DISA Data Interchange Standards Association DISOSS Distributed Office Support System [IBM] DIY Do It Yourself DJ Disc Jockey DLA Defense Logistics Agency DLI Data Link Interface(?) DLL Data Link Layer [ISO OSI] DLL Dial Long Line equipment DLO Dead Letter Office DM Dungeon Master DMA Direct Memory Access DMD Doctor of Dental Medicine DME Distance Measuring Equipment DMF Probably part of an X.400 address in Europe DMOS Diffusion Metal Oxide Semiconductor (see MOS) DMSP Defense Meteorological Satellite Program [Space] DMV Department of Motor Vehicles DMV Department of Motor Vehicles (Calif) DMZ DeMilitarized Zone DNA DeoxyriboNucleic Acid DNA Digital Network Architecture [DEC] DNCRI [NSF] (q.v.) Division of Networking and Communications Research and Infrastructure DNHR Dynamic NonHierarchical Routing DNIC Data Network Identification Code [Telephony] DNIS Dialed Number Identification Service (see also DID) [Telephony] DNL Director of Naval Laboratories DNR Dialed Number Recorder [Telephony] DNS Domain Name System DOA Dead On Arrival DOB Date Of Birth DOC Dynamic Overload Control DOD Department Of Defense [US Government] (sometimes DoD) DOE Department of Energy [US Government] DOHC Dual OverHead Cams [Automotive] DOMAIN Distributed Operating Multi Access Interactive Network (Apollo) DOS Disk Operating System DOT Department Of Transportation [US Government] DOT&E Director, Operational Test and Evaluation DOV Data Over Voice [Telephony] DOY Day of Year DP Data Processing DP Dial Pulse [Telephony] DP Displaced Persons (expelled from native land) DP Display Postscript DP Double Penetration DP Double Play DP Draft Proposal DPA Delegation of Procurement Authority DPANS Draft Proposed American National Standard DPI Dots Per Inch DPS Display PostScript DQ Dairy Queen DQ Dragon Quest DQDB Distributed Queue Dual Bus (IEEE 802.6) [Telephony, Networking] DQL Database Query Language DR Dead Reckoning DR Dining Room DRAM Dynamic Random Access Memory (as opposed to static RAM) DRD Data Reading Device DRE Directional Reservation Equipment DRG Democratic Republic of Germany (East Germany) DRI Defense Research Internet DRI Digital Research, Incorporated [Corporate name] d.s. died single [Genealogy] DS Double-Sided DS Draft Standard DSA Dial System Assistance DSE Data Structure Editor DSEE Domain Software Engineering Environment DSM Distinguished Service Medal DSO Distinguished Service Order DSP Decessit Sine Prole (died without issue) DSP Digital Signal Processing DSRI Digital Standard Relational Interface DSS Decision Support System DSS Direct Station Selection [Telephony] DST Daylight Saving Time DSTN Double SuperTwisted Nematic DSU Digital Service Unit DT Delirium Tremens DTE Data Terminal Equipment DTF Dial Tone First payphone [Telephony] DTMF Dial Tone Multi Frequency [Telephony] DTP DeskTop Publishing DTR Data Terminal Ready (EIA RS-232-C) DUI Driving Under the Influence DUT Device Under Test DV Deo Vo lente (God willing) DVM Digital Volt Meter DVM Doctor of Veterinary Medicine DWAPS Defense Warehousing Automated Processing System DWI Died Without Issue [Genealogy] DWI Driving While Intoxicated DWIM Do What I Mean DX Distance (as in long distance radio communication) DXT Data eXtractT facility d.y. died young [Genealogy] E East E Espionage EADASS Engineering and Administrative Data AcquiSition System EAFB Edwards Air Force Base [Space] EAN Certainly part of an X.400 Address in Europe EARN European Academic Research Network EAS Extended Area Service (or Engineering Admin. System) EASI European Academic Supercomputer Initiative (of IBM) EBCDIC Extended Binary Coded Decimal Interchange Code EC Exchange Carrier [Telephony] ECAFE Economic Commission for Africa and the Far East ECASS Electronically Controlled Automatic Switching System ECASS Export Control Automated Support System ECC Error Correction Code ECC Error Correction Code (corrects error in memory or transmission) ECCM Electronic Counter-CounterMeasures ECDO Electronic Community Dial Office ECG ElectroCardioGram ECL Emitter Coupled Logic (see also TTL) ECLSS Environmental Control and Life Support System [Space] ECM Electronic Counter Measure ECM European Common Market ECMA European Computer Manufacturers Association ECO Ecological ECO Electronic Central Office ECO Engineering Change Order ECPA Electronic Communications Privacy Act [US law] ECS Environmental Control System [Space] ECT ElectroConvulsive Therapy ECV Electric Cargo Vehicle [NASA OEXP] ED&D Expert Dungeons & Dragons EDGAR Electronic Data Gathering, Analysis, and Retrieval EDI Electronic Data Interchange EDIF Electronic Design Interchange Format EDO Extended Duration Orbiter [Space] EDP Electronic Data Processing EDS Electronic Data Systems EDT Eastern Daylight Time EDTA Ethylene Diamine Tetraacetic Acid EDTCC Electronic Data Transmission Communications Central EE Electrical Engineer EE Electrical or Electronics Engineer EEC European Economic Community EEC European Economic Comunity EEG ElectroEncephaloGram EEL Epsilon Extension Language E&EO Errors and Omissions Excepted EEPROM Electrically Erasable Programmable Read Only Memory EFF Electronic Frontier Foundation e.g. ??? (Latin(?): for example) EGA Enhanced Graphics Adapter EGP Exterior Gateway Protocol [Internet] EGRET Energetic Gamma Ray Experiment Telescope (on GRO) [Space] EHF Extremely High Frequency (30-300GHz) EIA Electronic Industries Association EINE EINE Is Not Emacs EISA Extended Industry-Standard Architecture EISS European Intelligence Support System EKG ElectroKardioGramm (see ECG) EL ElectroLuminescent (as in display) ELF Extremely Low Frequency ELO Electric Light Orchestra ELP Emerson, Lake and Palmer (or Powell) ELV Expendable Launch Vehicle [Space] E&M ``Ear and Mouth''; receive and transmit leads of a signalling system EM Enlisted Man (see EW) EMA Electronic Mail Association EMACS Editor MACroS EMACS Eight Megabytes And Constantly Swapping E-MAIL Electronic MAIL EMF ElectroMotive Force EMF ElectroMotive Force (voltage) EMI ElectroMagnetic Interference EMP Electromagnetic Pulse EMPRESS EnvironMental Pulse Radiation Environment Simulator for Ships EMR ElectroMagetic Response EMR ElectroMagnetic Response EMS Electronic Message System EMS Extended Memory Specification EMT Emergency Medical Technician EMU ElectroMagnetic Unit EMU Extravehicular Mobility Unit [Space] ENIAC Electronic Numerical Integrator and Calculator ENS ENSign EO End Office [Telephony] EO Erasable Optical EOF End Of File EOM End Of Month EOS Earth Observing System [Space] EOWG Engineering and Operations Working Group (under FNC) EP Experience Points EP Extended Play EPA Environmental Protection Agency EPOS Engineering and Project-management Oriented Support system EPRI Electric Power Research Institute EPROM Erasable Programmable Read Only Memory EPS Encapsulated PostScript EPT Empire of the Petal Throne EQ Educational Quotient (see IQ) ER Emergency Room ERA Earned Run Average ERA Entity-Relationship-Attribute ERA Equal Rights Amendment ERD Entity-Relation Diagram ERE Entity Relationship Editor ERT Earth Resources Technology [Space] ES Expert System ESA European Space Agency ESA European Space Agency [Space] ESAC Electronic Systems Assistance Center ESDI Enhanced Standard Device Interface ESE East South East ESF Extended Superframe Format [Telephony] ESM Electronic Support Measures ESnet Energy Sciences network (DoE) [Networking] ESO European Southern Observatory ESO European Southern Observatory [Space] ESP Extra Sensory Perception ESPS Entropic Signal Processing System ESS Electronic Switching System [Telephony] ESSEX Experimental Solid State EXchange EST Eastern Standard Time ET Eastern Time ET Extra Terrestrial [Space] ET (Shuttle) External Tank [Space] ETA Estimated Time of Arrival ET/ACC External Tank/Aft Cargo Carrier (see also ET) [Space] ETC Et cetera, and so on... ETD Estimated Time of Departure ETFD Electronic Toll Fraud Device [Telephony] ETH Eidgn\:oessiche Technische Hochschule (Swiss Federal Institute of Technology) ETLA Extended Three Letter Acronym [Space] ETO Earth-to-Orbit [Space] ETR Eastern Test Range [Space] ETS Electronic Translator System ETV Education TeleVision EUUG European Unix User Group EUV Extreme UltraViolet EUV Extreme UltraViolet [Space] EUVE Extreme UltraViolet Explorer [Space] EVA ExtraVehicular Activity EVA ExtraVehicular Activity [Space] EVX Electronic Voice eXchange EW Electronic Warfare EW Enlisted Woman (see EM) EWOS European Workshop for Open Systems FA Football Association (British soccer--a word derived from Association) FAA Federal Aviation Agency [US Government] FACD Foreign Area Customer Dialing FAO Food and Agriculture Organization [US Government] FAQ Frequently Asked Questions [Space] FAR Federal Acquisition Regulations FAS Foreign Agricultural Service FAS Free Alongside Ship FASST Flexible Architecture Standard System Technology FAST Fast Auroral SnapshoT explorer [Space] FAT Foreign Area Translation FAX FAcsimile FB Freight Bill FBI Federal Bureau of Investigation [US Government] FCC Federal Communications Commission [US Government] FCC Federal Computer Conference FCCSET Federal Coordinating Committee for Science, Education and Technology (under OSTP) {Maybe Eng. for Edu.??} FCO Field Change Order FCO Frequency Controlled Oscillator FCS Frame Check Sequence FDA Food and Drug Administration [US Government] FDDI Fiber Digital Data Interface FDDI Fiber Distributed Data Interface FDHD Floppy Drive High Density FDIC Federal Deposit Insurance Corporation FDIC Federal Deposit Insurance Corporation [US Government] FDM Frequency Division Multiplexing FDR Franklin Delano Roosevelt [US President] FE Field Engineer (see also CE, SE) FEA Finite Element Analysis FEDSIM FEDeral Systems Integration and Management center FEMA Federal Emergency Management Agency FEMF Foreign EMF (q.v.) (a.k.a. Cross Battery) [Telephony] FEPC Fair Employment Practices Commission FEPG Federal Engineering Planning Group (of FNC under EOWG, originally of FRICC) FERS Federal Employees Retirement System FET Federal Excise Tax FET Field Effect Transistor FFA Future Farmers of America FFT Fast Fourier Transform FFT Fast Fourier Transform [Space] FG-A Feature Group A [Telephony] (Line Side termination for LD carriers) FG-B Feature Group B [Telephony] (Trunk Side termination for LD carriers (aka ENFIA B), 950 service) FG-D Feature Group D [Telephony] (Trunk Side termination for LD carriers, 1+ service) FGS Fine Guidance Sensors (on HST) [Space] FHA Federal Home Administration FHA Future Homemakers of America FIB Focused Ion Beam FICA Federal Insurance Contributions Act FIDO Fog Investigation Dispersal Operation FIFO First In First Out (as in registers and buffers) FILO First In Last Out (see also FIFO) FIMS Forms Interface Management System FINE FINE Is Not Emacs FIO Frequency In and Out FIPS Federal Information Processing Standard FIR Far InfraRed [Space] FIR Finite Impulse Response FIRMR Federal Information Resource Management Regulation FIT Federal Information Technologies, inc. FITS Flexible Image Transport System [Space] FIX Federal Inter-agency eXchange [Networking] FL Florida FLACC Full Level Algol Checkout Compiler FLEA Four Letter Extended Acronym FLL Fixed Loss Loop [Telephony] FLOP FLoating point OPeration FLOPS FLoating-point OPerations per Second FLRA Federal Labor Relations Authority FM Frequency Modulation FMB Federal Maritime Board FMCS Federal Mediation and Conciliation Service FMR Follow Me Roaming [Telephony] FMS Financial Management Service (Treasury Dept) [US Government] FMS Forms Management System FNC Federal Networking Council (formerly FRICC) [US Government] (under OSTP) FO Foreign Office FO Forward Observer FOAC Federal Office Automation Center FOB Free On Board FOB Full Of Bull (aperiodical of) [TMRC] FOC Faint Object Camera (on HST) [Space] FOC Free Of Charge FOIA Freedom Of Information Act FOIMS Field Office Information Management System FOIRL Fiber Optic Inter(?) Repeater(?) Link(?) [Ethernet] FOOBAR See FUBAR [Net jargon] FOR Free On Rail FORCS Faa's Operational Reporting Communication System FORD Fix Or Repair Daily [Humor] FORD Found On Road Dead [Humor] FORTRAN FORmula TRANslator FOS Faint Object Spectrograph (on HST) [Space] FOSE Federal Office Systems Exposition FOT Fiber Optic Transceiver [Ethernet] FOT Free On Truck FOV Field Of View FPA Floating Point Accelerator FPC Fish Protein Concentrate FPE Floating Point Engine FPHA Federal Public Housing Authority FPLA Field Programmable Logic Array (see PLA) FPM Feet Per Minute FPO Field Post Office FPO Fleet Post Office fps Feet Per Second FPU Floating Point Unit FQDN Fully Qualified Domain Name [TCP/IP] (DNS) FR Frame Relay [Telephony, Networking] FRACTAL FRACTional dimensionAL FRED Fred Resembles Emacs Deliberately FRG Federal Republic of Germany (West Germany) FRICC Federal Research Internet Coordinating Committee (now FNC, q.v.) [Networking, US Government] FROG Free Rocket Over Ground FRPG Fantasy Role Playing Game FRS Federal Reserve System FS Field Service FS File System FS Full Standard FSF Free Software Foundation FSK Frequency Shift Keying FSLIC Federal Savings and Loan Insurance Corporation FSS Federal Supply Service FSW Forward Swept Wings Ft Foot FTAM File Transfer And Management (ISO upscale FTP) FTC Federal Trade Commission FTL Faster Than Light FTP File Transfer Protocol (esp. of the TCP/IP suite) FTS Federal Telecommunications System [Telephony, US Government] FTS Flight Telerobotic Servicer [Space] FUBAR F***ed Up Beyond All Recognition/Repair FUBAR Fouled Up Beyond All Recognition/Repair FUSE Far Ultraviolet Spectroscopic Explorer [Space] FW Fringeworthy FWD Front Wheel Drive FWHM Full Width at Half Maximum [Space] FX Foriegn eXchange [Telephony] FY Fiscal Year FYI For Your Information G General audiences [Movie rating] G Gravity GA Gamblers Anonymous GA General Assembly GA General Average GA General of the Army GA Georgia GAAP Generally Accepted Accounting Principles GAB Group Audio Bridging [Telephony] Gaia Earth's self-sustaining Biosphere (Not an acronym, from some ancient language, I think) GAN Global Area Network GAO General Accounting Office [US Government] GAR Grand Army of the Republic GARR Gruppo Arminizzazione Rete por la Ricerca (Italian Research Network Harmonization Group) GAS Get-Away Special [Space] GATT General Agreement on Tariffs and Trade GAW Guaranteed Annual Wage GAW Guarenteed Annual Wage GB Gangbusters GB GigaByte GB Great Britain GBIP General Purpose Interface Bus GBT Green Bank Telescope [Space] GC Garbage Collection (LISP) GC Gas Chromatograph (or Chromatography) GCA Ground Controlled Approach GCC Gnu C Compiler GCD Ground Controlled Descent GCL Graphics Command Language GCM General Court Martial GCR Group-Coded Recording (magnetic tape, 6250 bpi) GCT Greenwich Civil Time GCVS General Catalog of Variable Stars [Space] GDB Gnu DeBugger GDP Gross Domestic Product GDS Great Dark Spot [Space] GE General Electric GEM Giotto Extended Mission [Space] GEM Graphics Environment Manager GEO Geosynchronous Earth Orbit [Space] GHQ General HeadQuarters GHRS Goddard High Resolution Spectrograph (on HST) [Space] GHz Giga HertZ (unit of frequency, 1,000,000,000 cycles per second) GI Galvanized Iron GI Gastro Intestinal (as in upper GI) GI General Issue GI Government Issue GID Group ID [UNIX] GIF Graphics Interchange Format GIGO Garbage In Garbage Out GIN Graphics INput GISS Goddard Institute for Space Studies GKS Graphical Kernel Standard GKS Graphics Kernel System GM Game Master GM General Manager GM General Motors [Corporate name, Automobile] GM Guided Missile GMBH Gesellschaft Mit Beschraenkter Haftung GMC Giant Molecular Cloud [Space] GMD Gesellschaft f\:ur Mathematik und Datenverarbeitung (German Institute for Mathematics and Data Processing) GMRT Giant Meter-wave Radio Telescope [Space] GMT Greenwich Mean Time (also called UT) GNP Gross National Product GNU GNU's Not Unix GOES Geostationary Orbiting Environmental Satellite [Space] GOES Geostationary Orbiting Environmental Satellites [Space] GOSIP Government Open Systems Interconnection Profile (calls for government procurement of ISO/CCITT products) GOSIP Government OSI Profile GP General Practitioner GP General Purpose (RR engines and origin of Jeep) [Railroading, Automobile] GPC General Purpose Computer [Space] GPI Graphics Programming Interface GPIB General Purpose Interface Bus GPIB General-Purpose Interface Bus GPL GNU General Public Licence GPO General Post Office GPO Government Printing Office GPS Global Positioning System GPS Global Positioning System [Space] GQ General Quarters GRB Gamma Ray Burst(er) GREP Global Regular Expression Print, g/re/p, (UNIX command) GREP Global Regular Expression Print [UNIX] GRO Gamma Ray Observatory [Space] GRS Gamma Ray Spectrometer (on Mars Observer) [Space] GRS Great Red Spot [Space] GS General Schedule GS Glide Slope GSA General Services Administration GSA General Services Adminstration [US Government] GSA Girl Scouts of America GSBCA General Services administration Board of Contract Appeals GSC Guide Star Catalog (for HST) [Space] GSFC Goddard Space Flight Center (Greenbelt, MD) [NASA, Space] GSI Gesellschaft f\:ur Schwerionenforschung (German Federal Research Institute for Heavy Ion Research) GSM Global System Mobile GSM Groupe Speciale Mobile (Committee Designing preceding) GSTS Ground-based Surveillance and Tracking System GT Gross Ton GTE General Telephone and Electric [Corporate name] GTO Geostationary Transfer Orbit [Space] GTSI Government Technology Services, inc. GUI Graphical User Interface GW Gamma World GWEN Ground Wave Emergency Network GWM Generic Window Manager [X] H Harn H Height HACD Home Area Customer Dialing HAL Heuristically programmed ALgorithmic computer (movie 2001) HAM Hold And Modify HAO High Altitude Observatory [Space] Hb HemogloBin HBM Her British Majesty; His British Majesty HBO Home Box Office HC Holy Communion HC House of Commons HCFA Health Care Financing Administration HCFC hydrochlorofluorocarbon [Chemical] HCL High Cost of Living HD Hard Disk HD Heavy Duty HD Henry Draper catalog entry [Space] HDA Head Disk Assembly (in winchester disk drives) HDBV Host Data Base View HDL High Density Lipoprotein HDLC High-level Data Link Control [Networking] HDTV High Definition Television HE His Eminence HE His Excellency HEAO High Energy Astronomical Observatory [Space] HEDM High Energy-Density Matter [Space] HEMP Help End Marijuana Prohibition HEO High Earth Orbit [Space] HEPnet High Energy Physics network [Networking] HERO Hazards of Electromagnetic Radiation to Ordnance HF High Fantasy HF High Frequency (3-30MHz) HFE Human Factors Engineering HFS Hierarchical File System HGA High Gain Antenna [Space] HHS (US Department of) Health and Human Services HI Hawaii HIIPS Hud Integrated Information Processing Services HLC Heavy Lift Capability [Space] HLL High-Level Language HLV Heavy Lift Vehicle [Space] HMC Halley Multicolor Camera (on Giotto) [Space] HMOS High performance Metal Oxide Semiconductor (see MOS) HMS His/Her Majesty's Ship HMT His/Her Majesty's Transport HNPA Home Numbering Plan Area [Telephony] HOBIS HOtel Billing Information System HOL High-Order System HOTOL HOrizontal Take-Off and Landing HP Hewlett Packard, Inc. [Corporate name] HP High Pressure HP Higher Power (sort of an AA "in" term, usually God) HP Hit Points HP HorsePower HPGe High Purity Germanium HPL/T High-Productivity Languages/Tools HQ HeadQuarters HR Hertzsprung-Russell (diagram) [Space] HR House of Representatives HRH Her Royal Highness HRH His Royal Highness HRI High Resolution Imager (on ROSAT) [Space] HS High School HSB Hue, Saturation, Brightness HSP High Speed Photometer (on HST) [Space] HST Hawaiian Standard Time HST Hubble Space Telescope [Space] HT High Tension (as in electric power transmission) HTK Hits To Kill HUAC House Unamerican Activities Committee HUD Heads Up Display HUD Housing and Urban Development [US Government] HUPD Harvard University Police Department HUT Hopkins Ultraviolet Telescope (ASTRO package) [Space] HV High Voltage HVAC Heating, Ventilation, and Air Conditioning HW2000 Highway 2000 HWM High-Water Mark Hz HertZ (unit of frequency, cycles per second) IAB Internet Activities Board [Networking] IAEA International Atomic Energy Agency IANA Internet Assigned Numbers Authority (IANA@ISI.EDU) IATA International Air Transport Association IAU International Astronomical Union [Space] IAUC IAU Circular [Space] IBM Ingrained Batch Mentality IBM International Business Machines, Inc. [Corporate name] IBM Itty Bitty Machines IBT Illinois Bell Telephone IC Integrated Circuit IC Interexchange Carrier [Telephony] (see also IEC, IXC) ICB Interstate Computer Bank ICBM InterContinental Ballistic Missile ICE In-Circuit Emulator ICE International Cometary Explorer [Space] ICI Imperial Chemical Industries ICJ International Court of Justice ICL International Computers Ltd. ICMP Internet Control Message Protocol ICP Integrated Channel Processor ICP Inventory Control Points ICRC International Cosmic Ray Conference ID Idaho ID IDentification IDA Intercommunication Data Areas IDA International Dark-sky Association [Space] IDA International Development Association IDDD International Direct Distance Dial [Telephony] IDE Interactive Development Environments, inc IDF Intermediate Distributing Frame [Telephony] IDL Interactive Data Language [Space] IDV Interlibrational Derived Vehicle [Space] i.e. ???? (Latin(?): in other words (?)) IE Indo-European IEC Inter-Exchange Carrier [Telephony] (see also IC, IXC) IEE Institute of Electrical Engineers [UK] IEEE Institute of Electrical and Electronic Engineers IETF Internet Engineering Task Force IF Intermediate Frequency (as in IF stage) IFB Invitation For Bids IFC International Finance Corporation IFC International Freighting Corporation IFF Identification - Friend or Foe IFF Interchange File Format IFLA International Federation of Library Associations IFR Instrument Flight Rules [Aviation] IGES Initial Graphics Exchange Standard IGM InterGalactic Medium [Space] IGY International Geophysical Year IGY International Geophysical Year [Space] IHP Indicated HorsePower IHS Integrated Hospital Support IIA Information Industry Association IIE Institute of Industrial Engineers IIHF International Ice Hockey Federation IIL Integrated Injection Logic ILO International Labor Organization ILS Instrument Landing System ILV Industrial Launch Vehicle [Space] IMF International Monetary Fund IMHO In My Humble Opinion [Net jargon] IMO In My Opinion [Net jargon] IMP Interface Message Processor [ARPANET/MILNET] (replaced by PSN) IMSL International Mathematical Subroutine Library IN Indiana INADS INitialization and ADministration System [Telephony] INRA Iesus Nazerenus Rex Iudaeorum (Jesus of Nazareth, King of the Jews) INRIA Institut National de Recherche en Informatique et Automatique INS Immigration and Naturalization Service In-situ In Place [Latin] INSTITUTE INSTITUTE's Name Shows That It's Totally Unrelated To EMACS INTAP INteroperability Technology Association for information Processing INWATS INward Wide Area Telephone Service [Telephony] I/O Input/Output IO Input/Output (sometimes I/O) IOC International Operating Center [Telephony, US] IOD Identified Outward Dialing IOOF International Order of Odd Fellows IOTA Infrared-Optical Telescope Array [Space] IOTA International Occultation Timing Association [Space] IOU I Owe you(U) IP Information Provider [Telephony] IP Innings Pitched IP Intermediate Point IP Internet Protocol IPC Inter-Process Communication IPE Integrated Programming Environment IPMS InterPersonal Message Services IPS Inertial Pointing System [Space] IPS Information Processing Standards IPSE Integrated Project-Support Environment IQ Intelligence Quotient (see EQ) IR Index Register IR Infra-Red IRA Individual Retirement Account IRA Irish Republican Army IRAF Image Reduction and Analysis Facility [Space] IRAS InfraRed Astronomical Satellite [Space] IRBM Intermediate Range Ballistic Missile IRDS Information Resource Dictionary Standard IRDS InfraRed Detection Set IRE Institute of Radio Engineers (old name for the now IEEE, which see) IRM Information Resources Management IRMS Information Resources Management Service IRS Internal Revenue Service IRTF Internet Research Task Force IS Information Systems IS International Standard [ISO] (Beyond the DIS Stage) ISA Industry-Standard Architecture ISAM Indexed Sequential Access Method ISAS Institute of Space and Astronautical Science (Japan) [Space] ISBD International Bibliographic Description ISC Information Services Center ISC International Switching Center ISCH Interstitial-Cell-Stimulating Hormone (same as LH) ISDN Integrated Services Digital Network [Telephony] ISDT Integrated Systems Development Tool ISEE International Sun Earth Explorer (usually ISEE-3) ISF Information Systems Factory ISFUG Integrated Software Federal User Group ISI Information Sciences Institute ISM InterStellar Medium [Space] ISO Infrared Space Observatory [Space] ISO International Organization for Standardization ISO International Standards Organization [Space] ISODE ISO Development Environment ISOO Information Security Oversight Office ISPM International Solar Polar Mission ISPM International Solar Polar Mission (now Ulysses) [Space] ISR Institute of Snow Research ISRG Independent Space Research Group ISV Independent Software Vendor ISY International Space Year [Space] IT Industrial Technology IT Information Technology ITC Inter-Task Communication ITS Incompatible Timesharing System ITT International Telephone and Telegraph ITU International Telecommunications Union ITUSA IT Users Standards Association IUE International Ultraviolet Explorer [Space] IUS Inertial Upper Stage IUS Inertial Upper Stage [Space] IUV Interlibrational Utility Vehicle [Space] IXC Inter-eXchange Carrier [Telephony] (see also IC, IEC) IXI International (pan-European) X.25 Infrastructure JACM Journal of the Association for Computing Machinery JANET Joint Academic Network (UK) JBS John Birch Society JC Jesus Christ JC Joint Compound (plumbing) JC Julius Caesar JC Junior College JCA Jewelry Crafts Association JCAC Joint Civil Affairs Committee JCAE Joint Committee on Atomic Energy JCEE Joint Council on Economic Education JCET Joint Council on Educational Television JCS Joint Chiefs of Staff JD Justice Department JDS John Dewey Society JEM Japanese Experiment Module (for SSF) [Space] JES John Ericsson Society JET Joint European Torus (fusion research) JFK John F. Kennedy JFK John F. Kennedy (international airport) JFMIP Joint Financial Management Improvement Program JGR Journal of Geophysical Research JGR Journal of Geophysical Research [Space] JI Justice, Inc. JIC Joint Intelligence Center JIC Just in Case JILA Joint Institute for Laboratory Astrophysics [Space] JIM Job Information Memorandum JINTACCS Joint INteroperability of TActical Command and Control Systems JIS Japan Industrial Standards JISC Japanese Industrial Standards Committee JIT Just In Time JMS John Milton Society JNT Joint Network Team (UK) JO Job Order JO Junior Officer JOVE Jonathan's Own Version of Emacs JOVIAL Jules Own Version of the International Algorithmic Language JPL Jet Propulsion Laboratory JPL Jet Propulsion Laboratory [Space] JRC Junior Red Cross JSC Johnson Space Center JSC Johnson Space Center (NASA) [Space] JSD Jackson System Development JSRC Joint Services Review Committee JTIDS Joint Tactical Information Distribution Systems JV Junior Varsity JvNC John von Neumann (Super Computer) Center JvNCnet John von Neumann (Super Computer) Center network K Kilo- (metric 1000) K9 canine (K9 corps - army dogs) KAIST Korean Advanced Institute of Science and Technology KAO Kuiper Airborne Observatory [Space] KB KiloByte KC King's Counsel (QC when queen reigning) KC Knights of Columbus KD Kiln Dried KD Knocked Down KDCI Key Display Call Indicator KERMIT Kl-10 Error-free Reciprocal Micro Interconnect over Tty lines KET Kentucky Educational Television KHz Kilo HertZ (unit of frequency, 1000 cycles per second) KI Kiwanis International KIA Killed In Action KIAS Knot Indicated Air Speed Km Kilometers KO Knock Out [Boxing, Electric] KP Key Pulse [Telephony] KP Kitchen Police KPNO Kitt Peak National Observatory KPO KeyPunch Operator KQC King's College London K&R Kernighan and Ritchie, the c programming language KS King's Scholar KSC Kennedy Space Center (NASA) [Space] KSU Key System Unit [Telephony] KTB Cretaceous-Tertiary Boundary (from German) [Space] KTS Key Telephone System [Telephony] KTU Key Telephone Unit [Telephony] KWIC Key Word In Context KY Kentucky L1 Lagrange Point #1 35,000 Miles above moon [Space] L2 Lagrange Point #2 40,000 Miles behind moon [Space] L3 Lagrange Point #3 (?? 35,000 Miles below moon) [Space] L4 Lagrange Point #4 240,000 mile Earth orbit [Space] L5 Lagrange Point #5 240,000 mile Earth orbit [Space] LA Los Angeles LA Louisiana LA Low Altitude LADAR LAser Detection And Ranging LAM Master of Liberal Arts LAMA Local Automatic Message Accounting [Telephony] LAN Local Apparent Noon LAN Local Area Network LANL Los Alamos National Laboratory [Space] LANL Los Alamos (NM) National Laboratory LAPB Link Access Procedure (Balanced) LAPD Link Access Procedure (??) LAPD Los Angeles (CA, US) Police Department LAR Local Acquisition Radar LaRC Langley Research Center (NASA) [Space] LASER Light Amplification by Stimulated Emission of Radiation LAT Local Apparent Time LATA Local Access and Transport Area [Telephony] LAX Los Angeles International Airport LB Light Bomber LB pound (LiBra) LBHS Long Beach High School LBL Lawrence Berkeley (Calif.) Labs LBS Pounds LC inductor-Capacitor circuit (as in filters, L is symbol inductance) LCD Liquid Crystal Display LCD Lowest Common Denominator LCDR Lieutenant Commander LCL Less than Carload Lot [Railroading] LCL Lunar Cargo Lander [NASA OEXP] LCM Least Common Multiple LCM Life Cycle Management LCS Laboratory for Computer Science (of MIT) LCT Landing Craft Tanks LD Long Distance [Telephony] LDC Long Distance Carrier [Telephony] LDEF Long Duration Exposure Facility [Space, NASA] LDF Large Deployable Reflector [Space] LDL Low Density Lipoprotein LDX Long Distance eXtender [Telephony] LEAP Low-power Enhanced At Portable LEC Local Exchange Carrier [Telephony] LED Light Emitting Diode LEM Lunar Excursion Module (a.k.a. LM) (Apollo spacecraft) [Space] LEO Low Earth Orbit [Space] LEP Large Electron-Positron collider [CERN] LeRC Lewis Research Center (NASA) [Space] LEST Large Earth-based Solar Telescope [Space] LF Low Frequency (30-300KHz) LFSA List of Frequently Seen Acronyms (!) [Space] LGA Low Gain Antenna [Space] LGM Little Green Men [Space] LH Left Hand LH Liquid Hydrogen (also LH2 or LHX) [Space] LH Lower Half LH Luteinizing Hormone (same as ISCH) LHC Large Hadron Collider [CERN] LHD Litterarum Humaniorum Doctor (doctor of human letters) LHS Left Hand Side LI Long Island LIFIA Laboratoire d'Informatique Fondamentale et d'Intelligence Artificielle LIFO Last In First Out (see FIFO) LINC Laboratory INstrument Computer LISA Large Installation Systems Administration (USENIX specific?) LISP LISt Processing Language LIU Line Interface Unit LL Late Latin LL Long Lines [Telephony] LLB Legum Baccalaureus (bachelor of laws) LLD Legum doctor (doctor of laws) LLN Line Link Network [Telephony] LLNL Lawrence Livermore National Laboratories LLO Low Lunar Orbit [Space] LLOX Lunar Liquid Oxygen [Space] LLP Line Link Pulsing [Telephony] LM Life Master (Contract Bridge ranking) LM Lunar Module (a.k.a. LEM) (Apollo spacecraft) [Space] LMC Large Magellanic Cloud (see SMC) LMC Large Magellanic Cloud [Space] LMOS Line Maintenance Operations System [Telephony, AT&T] LN2 Liquid N2 (Nitrogen) [Space] LNG Liquified Natural Gas LOA Lands of Adventure LOFT Launch Operations Flight Test [Space] LOOPS Lisp Object Oriented Programming System LOP Lines Of Position LOSF Lunar Orbit Staging Facility [Space] LOTS Low Overhead Timesharing System LOX Liquid Oxygen LOX Liquid OXygen [Space] LP Long Play(ing) (record) LP Low Pressure LPC Linear Predictive Coding (speech processing) LPDA Link Problem Determination Aid LPF League for Programming Freedom LPG Liquefied Petroleum Gas LPG Low Pressure Gas LPL Lunar Personnel Lander [NASA OEXP] LPN Licensed Practical Nurse LPP Licensed Program Products LPR Line PrinteR LPT Lunar Propellant Tanker [NASA OEXP] LPV Lunar Piloted Vehicle [NASA OEXP] LRB Liquid Rocket Booster [Space] LRBM Long Range Ballistic Missile LRC Longitudinal Redundancy Character LRU Least Recently Used LRU Line Replaceable Unit LRV Light Rail Vehicle [Railroading] LS Left Side LS Letter Signed LS Locus Sigilli (place of seal) LSAP Logical(?, maybe Link) Service Access Point [OSI, Networking] LSB Least Significant Bit; Least Significant Byte LSB Lower Side Band LSC Lecture Series Committee (of MIT) LSC LightSpeed C LSD Least Significant Digit LSD LySergic acid Diethylamide LSD pounds (Libra), shillings (Sestertii), and (old) pence (Denarii) LSI Large Scale Integration LSP LightSpeed Pascal LSR Local Standard of Rest [Space] LSS Life Support System LSS Loop Switching System LSSD Level-Sensitive Scan Detection LT Long Ton LT Low Tension LTC Lieutenant Colonel LTJG Lieutenant Junior Grade LTL Less than Truckload Lot LTP Lunar Transient Phenomenon [Space] LUG Local Users Group LUT Look-Up Table LWM Low-Water Mark LWT London Weekend Television [Corporate name] LZ Landing Zone M Mega- (metric 10^6) m meter(s) m milli- (metric 1/1000) M Miniatures MA Massachusetts [US state postal designation] MAAP Maintenance And Administration Panel MAC an MIT interdepartmental lab (stands for many things) (renamed to LCS) MAC Media Access Control MAC Medium Access Control MAC Military Air Command MACSYMA project MAC's SYmbolic MAnipulation System MAD Mutual Assured Destruction MADD Mothers Against Drunk Driving MAG Magazine MAN Metropolitan Area Network MAP Manufacturing Automation Protocol MAP/TOP Manufacturing Automation Protocol/Technical Office Protocol MARBI MAchine Readable form of Bibliographic Information MARC MAchine Readable card Catalog MARS Multiuser Archival and Retrieval System MASC Multiple Award Schedule Contract MASER Microwave Amplification by Stimulated Emission of Radiation MASH Mobile Army Surgical Hospital MAST Multi-Application SOnar Trainer MAT-CALS Marine Air Traffic-Control And Landing System MAU Math Acceleration Unit MAU Media Access Unit MAU Medium Access Unit MB Manned Base [Space] MB MegaByte MBA Master Business Administration MBTA Massachusetts Bay Transportation Authority MC Master of Ceremonies MCA Micro Channel Architecture MCAE Mechanical Computer Aided Engineering MCC Master Control Console MCC Microelectronics and Computer technology Corporation MCC Mission Control Center [Space] MCP Master Control Program MCP/AS Master Control Program/Advanced System MCPO Master Chief Petty Officer MCSV Mars Crew Sortie Vehicle [NASA OEXP] MD Doctor of Medicine MD Maryland MD Maryland [US state postal designation] MD Medical Doctor MD Months after Date MDAS Magnetic Drum Auxiliary Sender MDC Metropolitan District Commision (Mass State Agency) MDE Modular Design Environment MDF Main Distribution Frame [Telephony] MDRE Mass Driver Reaction Engine [Space] MDT Mean Down Time ME Maine ME Mechanical Engineer MECO Main Engine CutOff [Space, Shuttle] MEd Master of EDucation MERP Middle-Earth Role Playing MeV Million Electron Volts MF Medium Frequency (300-3000KHz) MF Middle French MF Multi-Frequency [Telephony] MFA Master Fine Arts MFA Museum of Fine Arts [Boston] MFJ Modified Final Judgment [Telephony] MFLOPS Million FLoating-point OPerations per Second (see also FLOPS) MFM Modified Frequency Modulation MFS Macintosh File System MG Machine Gun MG Major General MG Military Government MGH Massachusetts General Hospital MGM Metro-Goldwyn Mayer [Corporate name] MHD MagnetoHydroDynamics MHS Mail Handling System [ISO] MHz Mega HertZ (unit of frequency, 1,000,000 cycles per second) MI Michigan MI Military Intelligence MIA Missing In Action MIB Management Information Base MIDI Musical Instrument Digital Interface MIFASS Marine Integrated Fire And Support System MILNET MILitary NETwork MIM Morality In Media MIMD Multiple Instruction, Multiple Data MINCE MINCE Is Not Complete Emacs MINE MINE Is Not Emacs (but it is mine) MIPS Million Instructions Per Second Mir Peace [Russian] MIRV Multiple Independently-Targetable Reentry Vehicle MIS Management Information System MIT Massachusetts Institute of Technology ML Middle Latin mL milliliter(s) MLA Member of Legislative Assembly (see MPP) MLD Minimum Lethal Dose MLL Mars Logistics Lander [NASA OEXP] MLS Microwave Landing System MLS Multi-Level Security MLV Medium Lift Vehicle [NASA OEXP] MM Maryknoll Missioners mm millimeters MMES Martin Marietta Energy Systems MMFS Manufacturing Message Format Standard MMH MonoMethyl Hydrazine [Space] MMM see 3M MMT Multiple Mirror Telescope [Space] MMU Manned Maneuvering Unit [Space] MMU Memory Management Unit MMW Multi-Mega Watt [Space] MN Minnesota MNA Member of National Assembly (Quebec) MNP Microcom Networking Protocol [Corporate name] MNRAS Monthly Notices of the Royal Astronomical Society [Space] MO Mail Order MO Medical Officer MO Missouri MO Modus Operandi MO Money Order MOC Mars Observer Camera (on Mars Observer) [Space] MOD Ministry of Defence (UK) (sometimes written MoD) MOL Manned Orbiting Laboratory [Space] MOLA Mars Observer Laser Altimeter (on Mars Observer) [Space] MOMA Museum of Modern Art [New York] MOMV Manned Orbital Maneuvering Vehicle [Space] MOR Middle-Of-the-Road MOS Metal Oxide Semiconductor MOSFET Metal Oxide Semiconductor Field Effect Transistor MOTAS Member Of The Appropriate Sex MOTIS Member Of The Inappropriate Sex MOTIS Message-Oriented Text Interchange System MOTOS Member of the Opposite Sex MOTSS Member of the Same Sex MOTV Manned Orbital Transfer Vehicle [Space] MOU Memorandum Of Understanding MOUSE Minimum Orbital Unmanned Satellite of Earth MP Melting Point MP Member of Parliament MP Metropolitan Police MP Military Police(man) MPC Minor Planets Circular [Space] MPE Mission to Planet Earth [Space] MPG Miles Per Gallon MPH Miles Per Hour MPP Member of Provincial Parliament (Canada; also MLA) MPR Mars Pressurized Rover [Space] MPV Mars Piloted Vehicle [NASA OEXP] MPW Macintosh Programmer's Workshop MR Miniatures Rules MRI Magnetic Resonance Imaging MRP Manufacturing Requirements Planning MRSR Mars Rover and Sample Return [Space] MRSRM Mars Rover and Sample Return Mission [Space] MS ManuScript MS Master of Science MS Military Science MS Motor Ship MS Multiple Sclerosis MSB Most Significant Bit; Most Significant Byte MSC MicroSoft C MSCP Mass Storage Control Protocol MSD Most Significant Digit MS-DOS MicroSoft DOS MSE Mobile Subscriber Equipment MSFC (George C.) Marshall Space Flight Center (NASA) [Space] MSFC Marshall Space Flight Center MSG MonoSodium Glutamate MSH Marvel Super Heroes MSL Mean Sea Level MSPCA Massachussetts Society for the Prevention of Cruelty to Animals MSPE Mercenaries, Spies & Private Eyes MSRP Manufacturer's Suggested Retail Price MSS Management Support System MSS ManuScriptS MSS Mass Storage System MSS Maximum Segment Size [TCP/IP] (see also MTU) MST Mountain Standard Time MT Metric Ton MT Mountain Time MTA Message Transfer Agent MTA Metropolitan Transportation Authority MTBF Mean Time Between Failures MTC Man Tended Capability [Space] MTR Magnetic Tape Recording MTSO Mobile Telephone Switching Office [Telephony] MTTF Mean Time To Failure MTTR Mean Time To Recovery MTTR Mean Time To Repair MTU Maximum Transfer Unit [Networking] (see also MSS) MTV Music TeleVision MUF Maximum Usable Frequency (max freq during sunspot activity) MULTICS MULTiplex Information Computer Services MUMPS Mgh Utility MultiProgram System MUNG Mung Until No Good (see the hacker's dictionary) MUX MUltipleXor MVA MegaVolt Ampere MVS Multiple Virtual Storage [IBM] MX Missile eXperimental N North N Notice NA Narcotics Anonymous NA North America NA Not Applicable NAACP National Association for the Advancement of Colored People NAAS North American Automated Systems co. NAB National Association of Broadcasters NABISCO NAtional BIScuit COmpany [Corporate name] NACCIRN North American Coordinating Committee for Intercontinental Research Networking (see also CCIRN) NACS National Advisory Committee on Semiconductors NAD Network Access Device NADGE NATO Air Defense Ground Environment NAG Numerical Algorithms Group NAGE National Association of Government Employees NAK Negative AcKnowledge NAM Name and Address Module [Telephony] (cellular phone changeable ROM) NAM National Account Manager [Telephony, AT&T] NAM Number Assignment Module [Telephony] (cellular phone changeable ROM) NANP North American Numbering Plan NAPAP National Acid Precipitation Assessment Program NAR Nuclear Acoustic Resonance NARDAC NAvy Regional Data Automation Center NAS National Academy of Sciences NAS National Advanced Systems NASA National (US) Aeronautics and Space Administration [Space] NASDA NAtional (Japan) Space Development Agency [Space] NASM National (US) Air and Space Museum [Space] NASP National (US) AeroSpace Plane [Space] NATO North Atlantic Treaty Organization NAVDAC NAVal Data Automation Command NAVSWC NAVal Surface Weapons Center NB New Brunswick NB Nota Bene NBA National (US) Basketball Association NBC National (US) Broadcasting Company [Corporate name] NBFM NarrowBand Frequency Modulation NBO Network Build Out NBS National Bureau of Standards (renamed NIST) [US Government] NBVM Narrow Band Voice Modulation NC No Charge NC No Connection NC North Carolina NCA Network Control Analysis NCC National (US) Computer Conference NCC National (US) Council of Churches NCDC National (US) Climatic Data Center NCE New Catholic Edition NCGA National (US) Computer Graphics Association NCI National (US) Cancer Institute [US Government] NCIC National (US) Cartographic Information Center NCO Non-Commissioned Officer NCP Network Control Program NCR National (US?) Cash Register [Corporate name] NCS Network Computing System NCSA National (US) Center for Supercomputing Applications NCSC National (US) Computer Security Center [NSA] NCTL National Computer and Telecommunications Laboratory NCV No Commercial Value ND No Date ND North Dakota NDA Non-Disclosure Agreement NDDL Neutral Data Definition Language NDE News Development Environment NDEA National (US) Defense Education Act NDL Network Database Language NDP New Democratic Party (Canada) NDSL National (US) Defense Student Loan NDSL National (US) Direct Student Loan NDT Newfoundland Daylight Time NDV NASP Derived Vehicle NDV NASP Derived Vehicle [Space] NE New England NE North East NEAR National Electronic Accounting and Reporting system NEARnet New England Academic and Research Network NEB New English Bible NEC Nippon Electric Company [Corporate name] NEI Not Elsewhere Included NES National Energy Strategy NES Not Elsewhere Specified NESC National Energy Software Center NET National (US) Educational Television NET NETwork NET New England Telephone NEWS Network extensible Window System NEXRAD NEXt generation weather RADar NF No Funds NFC National (US) Football Conference NFFE National (US) Federation of Federal Employees NFL National (US) Football League NFS Network File System NG National Guard NG No Good NGC New General Catalog [Space] NH New Hampshire NHI National Health Insurance NHL National (Canada) Hockey League NHLBI National Heart, Lung, and Blood Institute (Bethesda, MD) NIC Network Information Center ("The NIC" is NIC.DDN.MIL) NICMOS Near Infrared Camera / Multi Object Spectrometer (HST upgrade) [Space] NIFTP (a file transfer network in the UK) NIH National (US) Institutes of Health NIH Not Invented Here NIM Nuclear Instrumentation Module (an electronic instr. standard) NIMH National Institute of Mental Health (Rockville, MD) NIMS Near-Infrared Mapping Spectrometer (on Galileo) [Space] NIR Near InfraRed [Space] NIS Network Information System (formerly yp) NISO National Information Standards Organization NIST National Institute of Standards and Technology (formerly NBS) [US Government] NJ New Jersey NJB New Jersey Bell [Telephony] NL National League (baseball) NLM National Library of Medicine NLP Natural Language Processing NLRB National Labor Relations Board NLS Network License Server NM Nautical Mile NM New Mexico NM Night Message NM No Mark; Not Marked NMOS N channel Metal Oxide Semiconductor (N-MOS) (see MOS) NMR Nuclear Magnetic Resonance NMS Network Monitoring Station NNE North North East NNTP Net News Transfer Protocol NNW North North West NNX NANP syntax for a three-digit string, N:{2-9}, X:{0-9} [Telephony] NOA NSWC Office Automation NOAA National Oceanic and Atmospheric Administration [Space, US Government] NOAO National (Tucson, AZ, US) Optical Astronomical Observatories [Space] NOC Network Operations Center NORAD NORth American Defense Command NORM Naturally Occuring Radioactive Material NORML National Organization for the Reform of Marijuana Laws NOS Not Otherwise Specified NOSC Naval Ocean Systems Center NOTIS Network Operator Trouble Information System NOW Negotiable Order for Withdrawal [Banking] (Is this MA or NE specific?) NOx Nitrogen Oxides NP No Protest NP Nondeterministic-Polynomial NP Notary Public NP Noun Phrase NPA Numbering Plan Area (area code) [Telephony] NPC Non-Player Character (see PC) [Role-playing] NPL National Physical Laboratory (UK) NPL Non-Procedural Language NPN Negative-Positive-Negative (transistor) NPN NonProtein Nitrogen NPR National Public Radio NPR non-Processor Request [PDP11, UNIBUS] NQS Network Queuing System NRA National Reconstruction Act (FDR era US) NRA National Rifle Association NRAO National Radio Astronomical Observatory [Space] NRC National Research Council NRC Nuclear Regulatory Commission NRE Non-Recurring Engineering (as in NRE costs) NREN National (US) Research and Education Network NRL Naval Research Labs NRO National Reconnaissance Office NRO National Reconnaissance Organization [Space] NRZ Non-Return to Zero NRZI Non-Return to Zero Inverted (magnetic tape, 800 bpi) NS Neutron Star [Space] NS Not Specified NS Nova Scotia NS Nuclear Ship NSA National Security Agency [US Government] NSAP Network Service Access Point [OSI, Networking] NSC National (US) Security Council [US Government] NSE Network Software Environment NSF National (US) Science Foundation [US Government] NSS Nodal Switching System [NSFnet] NSSDC National Space Science Data Center [Space] NST Newfoundland Standard Time NSTS National Space Transportation System [Space] NSW New South Wales (Australia) NSWC Naval Surface Warfare Center NSWC Naval Surface Weapons Center NT New Testament NT Newfoundland Time NT Northern Territory NTEU National Treasury Employees Union NTIS National Technical Information Service NTN Neutralized Twisted Nematic NTP Network Time Protocol [Internet] NTP Normal Temperature and Pressure (see STP) NTSB National Transportation Safety Board [US Government] NTSC National Television Standards Committee NTSC Never Twice Same Color NTT New Technology Telescope [Space] NTT Nippon Telephone & Telegraph NU Name Unknown NURBS NonUniform Rational B-Spline NUSC Naval Underwater Systems Center [US Government] NV Nevada NW North West NWNET NorthWestNet NWS National Weather Service NWT North West Territories (Australia) NXX NANP syntax for a three-digit string, N:{2-9}, X:{0-9} [Telephony] NY New York NYC New York City NYNEX New York and New England (Telephone) NYPD New York Police Department NYSE New York Stock Exchange NYSERNet New York State Educational and Research Network NZ New Zealand NZUSUGI New Zealand Unix System User Group, Inc. OA Office Automation OA Overeaters Anonymous OAO Orbiting Astronomical Observatory [Space] OAS Organization of American States OATS Office Automation Technology and Services OBE Order of the British Empire OBS Omni Bearing Selector OC Order of Canada OCDM Office of Civil Defense and Mobilization OCI Out of City Indicator OCLC Online Computer Library Center, Inc. OCLC Online Computer Library Center (Ohio College Library Catalog) OCO Object Code Only OCR Optical Character Recognition OCS Officer Candidate School OCST Office of Commercial Space Transportation [Space] OD Doctor of Optometry OD Oculus Dexter (right eye) OD Officer of the Day OD OverDose ODI Optical Digital Image ODISS Optical Digital Image Storage System ODT Octal Debugging Technique ODT Online Debugging Technique OE Old English OED Oxford English Dictionary OEM Original Equipment Manufacturer OEO Office of Economic Opportunity OES Order of the Eastern Star OEXP Office of Exploration [NASA] OF Old French OFM Order of Friars Minor OFS Order of Free State OG Original Gum OH Ohio OIRA Office of Information and Regulatory Affairs OIU Office Interface Unit OJT On the Job Training OLTP On-Line Transaction Processing OMB Office of Management and Budget [US Government] OMD Orchestral Manouevers in the Dark OMS Orbital Maneuvering System [Space] OMV Orbital Maneuvering Vehicle [Space] ON Old Norse ONC Open Network Computing ONI Office of Naval Intelligence ONI Operator Number Identification [Telephony] ONR Office of Naval Research OOP Object Oriented Programming OOPART Out Of Place ARTifact OOPS Object-Oriented Programming System OP Observation Post OP OFFICEPOWER office automation system, trademark of CCI OP Order of Preachers OP Out of Print OPEC Organization of Petroleum Exporting Countries OPF Orbiter Processing Facility [Space] OPM Office of Personnel Management OPUS Obvious Password Utility System (Eugene Spafford <Spaf@Purdue.Edu>) OR Operating Room OR Oregon OR Owner's Risk, Own Risk ORFEUS Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer [Space] ORNL Oak Ridge National Laboratory OROM Optical Read Only Memory OS Oculus Sinister (left eye) OS Operating System OS Ordinary Seaman OS Out of Stock OSB Order of St. Benedict OSC Orbital Sciences Corporation [Space] OSCAR Orbiting Satelite Carry Amateur Radio (1st launched 12 Dec 1961) OSCAR Orbiting Satellite Carry Amateur Radio (1st launched 12 Dec 1961) OSCAR Orbiting Satellite Carrying Amateur Radio [Space] OSCRL Operating System Command Response Language OSD Office of the Secretary of Defense OSDIT Office of Software Development and Information Technology OSF Open Software Foundation OSF Open Systems Foundation OSF Order of St. Francis OSHA Occupational Safety and Health Administration [US Government] OSI Office of Scientific Integrity [NIH] OSI Open Systems Interconnection (per ISO; 7 layer model) OSI/RM Open Systems Interconnection/Reference Model OSME Open Systems Message Exchange OSP Optical Storage Processor OSPFIGP Open Shortest-Path First Internal Gateway Protocol [Internet] OSS Office of Strategic Services (later CIA) OSS Office Support System OSS Operation Support System [Telephony, AT&T] OSSA Office of Space Science and Applications [Space] OSSE Oriented Scintillation Spectrometer Experiment (on GRO) [Space] OSTP Office of Science and Technology Policy OSTP (White House) Office of Science and Technology Policy [US Government] OT Old Testament OT OverTime OTA Office of Technical Assistance OTA Office of Technology Assessment OTA Optical Telescope Assembly (on HST) [Space] OTB Off-Track Betting OTC Over The Counter (stocks) OTF Open Token Foundation OTH-B Over The Horizon - Backscatter (as in radar) OT&LF Open Taxi & Limousine Foundation OTR On The Rag OTS Officers' Training School OTV Orbital Transfer Vehicle [Space] OUTWATS OUTward Wide Area Telephone Service [Telephony] OV Orbital Vehicle [Space] OV Orbiter Vehicle [Space] PA Pennsylvania PA Per Annum PA Play Aid PA Power of Attorney PA Press Agent PA Private Account PA Public Address PA Purchasing Agent PABX Private Automatic Branch eXchange [Telephony] PACCOM Pacific Computer Communications network consortium [Networking] PACX Private Automatic Computer eXchange PAD Packet Assembler-Disassembler [Networking] PAH Polycyclic Aromatic Hydrocarbon PAL Phase Alternation Line-rate PAL Programmable Array Logic PAM Payload Assist Module [Space] PAM Pulse Amplification Modulation PARC Palo Alto Research Center, xerox PASS Personal Access Satellite System [NASA] PATROL Program for Administrative Traffic Reports On Line PBM Play By Mail game PBS Public Broadcasting System PBX Private Branch eXchange [Telephony] PC Peace Corps PC PerCent; PerCentage PC Personal Computer (IBM wants you to believe a specific kind) PC Player Character (see NPC) [Role-playing] PC Post Card PC Post Cibum (after meals) PC Privileged Character PC Privy Council PC Program Counter PC Progressive Conservative party [Canada] PC Providence College PC/AT Personal Computer/Advanced Technology PCB PolyChlorinated Biphenyl PCB Printed Circuit Board PC-DOS Personal Computer DOS PCI Panel Call Indicator PCIE President's Council on Integrity and Efficiency PCL Printer Command Language PCM Plug-Compatible Mainframe PCM Pulse Code Modulation PCPC Personal Computers Peripheral Corporation PCS Permanent Change of Station PCTE Portable Common Tools Environment PCTS Posix Conformance Test Suite PD Per Diem PD Police Department PD Potential Difference PD Public Domain PDAD Proposed Draft ADdendum PDE Partial Differential Equation PDES Product Data Exchange Specifications PDF Program Development Facility PDL Page Description Language PDL Program Design Language PDN Public Data Network PDP Plasma Display Panel PDP Programmed Data Processor PDP Programmed Data Processor [DEC] PDQ Pretty Damned Quick PDS Premises Distribution System [AT&T] PDT Pacific Daylight Time PE Phase Encoded PE Physical Education PE Prince Edward island PE Printer's Error PE Professional Engineer PE Protestant Episcopal PEI Prince Edward Island PEP Productivity Enhancement Project PEPE Pepe Est Presque Emacs PERL Pathologically Eclectic Rubbish Lister PERL Practical Extraction and Report Language PEX Phigs/phigs+ Extension to X PFC Plasma Fusion Center [MIT] PG Parental Guidance (suggested) [Movie rating] PGA Professional Graphics Adapter PGA Pure Grain Alcohol PHA Pulse Height Analyzer (or Analysis) PHIGS Programmers Hierarchical Interactive Graphics System PHS Public Health Service PhysRev Physical Review Journal - Phys Rev PI Principal Investigator PI Priority Interrupt PI Private Investigator PIC Plastic/Polyethelene Insulated Cable [Telephony] PIC Position Independant Code PIF Paid In Full PIT Principal, Interest, and Taxes PIXEL PIcture ELement PLA Programmable Logic Array PLATO Programmed Learning for Automated Teaching Operations (U. Ill., early '70s) PLC Programmable Logic Controller PLCC Plastic Leaded Chip Carrier PLL Phase-Locked Loop PLM Programming Language for Microcomputers PLO Palestine (sic?) Liberation Organization (?) PLO Please Leave On PLSS Portable Life Support System [Space] PM PayMaster PM Police Magistrate PM Post Meridiem PM Post Meridiem (after noon) PM PostMaster PM PostMortem PM Pressurized Module [Space] PM Preventive Maintenance PM Prime Minister PM Provost Marshal PMC Permanently Manned Capability [Space] PMIRR Pressure Modulated InfraRed Radiometer (on Mars Observer) [Space] PMO Prime Minister's Office PMOS P channel Metal Oxide Semiconductor (P-MOS) (see MOS) PMS PreMenstrual Syndrome PMT PhotoMultiplier Tube PM/X Presentation Manager for X windows PN Promissory Note PNP Positive-Negative-Positive (transistor) PO Petty Officer PO Post Office PO Postal Order PO Purchase Order POC Port Of Call POD Pay On Delivery POE Port Of Embarkation POE Port Of Entry POGO Polar Orbiting Geophysical Observatory POM Phase Of Moon POP Point of Presence [Telephony] POP Post Office Protocol [Networking] (esp. TCP/IP) POPS Paperless Order Processing System POR Price On Request POS Point Of Sale POS Professional Operating System [DEC] POSI Promoting conference for OSI POSIX Portable Operating System for unIX POSIX Portable Operating System Interface POTS Plain Old Telephone Service [Telephony] POTV Personnel Orbit Transfer Vehicle [Space] POV Point Of View POW Prisoner Of War PP Parcel Post PP Past Participle PP Post Pay (payphone) [Telephony] PP Primary Point PPB Parts Per Billion PPC Pour Prendre Conge' (to take leave) PPCS Person to Person, Collect, Special [Telephony] PPM Parts Per Million PPN Parameterized Post-Newtonian formalism for general relativity PPN Project Programmer Number PPP Point-to-Point Protocol (successor to SLIP (q.v.)) pps Packets per Second PPS PostPostScriptum PPT Parts Per Trillion PPT Pulse Pair Timing PPT Punched Paper Tape PQ Province of Quebec PR PayRoll PR Public Relations PR Puerto Rico PRC Planning Research Corporation PREPnet Pennsylvania Research & Economic Partnership Network PRI Primary Rate Interface (ISDN) [Telephony] PRN pro re nata [Medicine] (as needed?) PROFS PRofessional OFfice System [IBM] PROM Programmable Read-Only Memory PS PicoSecond PS PostScript PS PostScriptum PS Power Steering PS Power Supply PS Proposed Standard PS Public School PSA Problem Statement Analyzer PSC Pittsburgh Supercomputer Center PSC Polar Stratospheric Clouds PSDN Public Switched Data Network [Telephony] PSDS Public Switched Digital Service [Telephony, AT&T] PSE Programming Support Environment PSF Point Spread Function [Space] PSG Platoon SerGeant PSI Performance Systems International [Corporate name, Networking] PSI Power Systems, Incorporated [Corporate name, Model Railroading] PSK Phase Shift Keying PSL Problem Statement Language PSN Packet Switch Node [ARPANET/MILNET] (replaced IMP) PSR Product Specific Realizations PSR PulSaR [Space] PSS (unknown to me, but something in the UK environment) PST Pacific Standard Time PSTN Public Switched Telephone Network PT Pacific Time PT Patrol Torpedo (as in PT boat) PT Physical Therapy PT Physical Training PTA Parent-Teacher Association PTD Parallel Transfer Disk PTL Praise The Lord (ministry) PTN Plant Test Number [Telephony] (actual number assigned for 800 service) PTO Patent and Trademark Office PTO Please Turn Over PTO Power Take-Off PTT Post, Telephone and Telegraph administration PTV Passenger Transport Vehicle [Space] PUC Public Utilities Commision PV Photovoltaic [Space] PVC Permanent Virtual Circuit (see also VC) PVC Poly-Vinyl Chloride PVO Pioneer Venus Orbiter [Space] PW Prisoner of War (usually POW) PWG Permanent Working Group PX Post eXchange (see BX) QAM Quadrature Amplitude Modulation QC Quality Control QC Queen's Counsel (KC when queen reigning) QD Quaque Die (daily) [Medicine] QDA Quantity Discount Agreement QED Quod Erat Demonstrandum (which was to be demonstrated) [Latin] QEF Quod Erat Faciendum (which was to be done) [Latin] QEI Quod Erat Inveniendum (which was to be found out) [Latin] QET Quantum Effect Transistor QIC Quarter-Inch Cartridge QID Quater In Die (four times a day) [Medicine] QLI Query Language Interpreter QM QuarterMaster QMC QuarterMaster Corps QMF Query Management Facility QMG QuarterMaster General QMS Quality Micro Systems [Corporate name] QNS Quantity Not Sufficient QSO Quasi-Stellar Object [Space] q.v. ???? (Latin(?): which see) QWERTY first six keys from left on top alphabetic row of standard keyboard R Restricted [Movie rating] R Rolemaster RA Regular Army RA Research Assistant RA Royal Academy RAAF Royal Australian Air Force RACE Random Access Card Equipment RACEP Random Access and Correlation for Extended Performance RAD Radiation Absorbed Dose RAD Rapid Access Disk RADAR RAdio Detection And Ranging RADM Rear ADMiral RAF Royal Air Force RAM Random Access Memory (R/W) RAM Red Academicia de Mexico (Mexican Academic Network) RARDE Royal Armaments Research and Development Establishment RARE R\'eseaux Associ\'es pour la Recherche Europ\'eenne (the European Organization of Research Networks) RAS Reliability, Availability, and Serviceability RASC Residence Account Service Center RATS Radio Amateur Telecommunications Society R&B Rhythm and Blues (commonly R and B) RBC Red Blood Count RBI Runs Batted In RBOC Regional Bell Operating Company RC Red Cross RC Regional Center RC Resistor-Capacitor circuit (as in filters) RC Roman Catholic RCA Radio Corporation of America [Corporate name] RCAF Royal Canadian Air Force RCAS Reserve Component Automation System RCC Radio Common Carrier RCMP Royal Canadian Mounted Police RCS Reaction Control System [Space] R&D Research and Development (commonly R and D) RD Rural Delivery RDA Remote Data Access RDBMS Relational DataBase Management System RDF Radio Direction Finding REA Rail Express Agency RECON Reconnaissance REM Rapid Eye Movement REO R. E. Olds REO Removable, Erasable, Optical RETMA Radio {something(equipment?)?} {something?} Manufacturers' Association (????) REXX Restructured EXtended eXecutor RF Radio Frequency RF Radio Frequency [Space] RFC Request For Comments (ala ARPA Internet) RFD Rehoboth (MA) Fire Department RFD Rural Free Delivery RFI Radio Frequency Interference RFI Radio Frequency Interference [Space] RFP Request for Proposal RFQ Request for Quote RFS Remote File System RGB Red Green Blue RGP Raster Graphics Processor RH Right Hand RHC Regional (Bell) Holding Company RHS Right Hand Side RI Rhode Island RIACS Research Institute for Advanced Computer Science (NASA) RIACS Research Institute for Advanced Computer Science [Space] RIAS Radio In the American Sector, berlin RIF Reading Is Fundamental RIF Reduction In Force RILM Repertoire International de Literature Musicale RIP Rest In Peace (or Requiescat In Pace : latin) RIP Routing Interchange Protocol RIPE R\'eseaux IP Europ\'eenne (European IP Networks) (of RARE, q.v.) RISC Reduced Instruction Set Computer RITA Recognition of Information Technology Achievement award RJE Remote Job Entry RLC Resistor Inductor Capacitor RLG Research Libraries Group RLIN Research Libraries Information Network (run by RLG (q.v.)) RLL Run Length Limited RMA Radio Manufacturers' Association RMA Return Materials Authorization RMATS Remote Maintenance Administration and Traffic System [Telephony] RMS Remote Manipulator System [Space] RMS Richard M. Stallman RMS Root Mean Square RMS Royal Mail Ship RN Registered Nurse RN Royal Navy RNA RiboNucleic Acid RNGC Revised New General Catalog [Space] RNZAF Royal New Zealand Air Force ROFF Run-OFF ROG Receipt Of Goods ROM Range Of Motion [Medicine] ROM Read-Only Memory ROM Rupture Of Membrane (as in birth) ROSAT ROentgen SATellite [Space] ROSE RATS (q.v.) Open Systems Environment ROSE Remote Operations Service Entity (per ISO/CCITT layer 7) ROTC Reserve Officers' Training Corps ROTS Rotary Out Trunks Selectors ROYGBIV Red, Orange, Yellow, Green, Blue, Indigo, Violet RPC Remote Procedure Call RPG RePort Generator RPG Role Playing Game RPI Rensselaer Polytechnic Institute RPM Revolutions Per Minute RPN Reverse Polish Notation RPO Railway Post Office RPS Revolutions Per Second RPV Remotely Piloted Vehicle RQ RuneQuest RR RailRoad RR Route Relay RR Rural Route RRO Rate and Route Operator [Telephony] RS Recommended Standard (EIA) RS Recording Secretary RS Revised Status RS Right Side RS Royal Society RSCS Remote Spooling Communications Subsystem RSFSR Russian Soviet Federated Socialist Republic RSN Real Soon Now RSU Remote Switching Unit RSV Revised Standard Edition RSVP Repondez S'il Vous Plait (please reply) RSWC Right Side up With Care RT RadioTelephone RT RealTime RTA Remote Trunk Arrangement [Telephony] RTAC Regional Technical Assistance Center [Telephony] RTF Rich Text Format RTFM Read The @!# Manual RTFM Read The F***ing Manual RTG Radioisotope Thermoelectric Generator RTG Radioisotope Thermoelectric Generator [Space] RTLS Return To Launch Site (Shuttle abort mode) [NASA, Shuttle, Space] RTR Ready to Run [Model Railroading] RTR Reel-To-Reel RTS Request To Send (EIA RS-232-C) RTTY Radio Teletype RU Receive Unit RVD Remote Virtual Disk [MIT] RW Right Worshipful RW Right Worthy RX Receive Ry Railway S South S Supplement SA Salvation Army SA Seaman Apprentice SA Service Assistant SA Sex Appeal SA Sine Anno (without date) SA South Africa SA South America SA Subject to Approval SAA South Atlantic Anomaly SAA South Atlantic Anomaly [Space] SAA Systems Application Architecture SAC Special Area Code [Telephony] (represent services, not places) SAC Strategic Air Command (see TAC) SAC Strategic Air Command [US military] SADD Students Against Drunk Driving SAFENET Survivable Adaptable Fiberoptic Embedded Network [US Navy] SAM Surface to Air Missile SAM Surface-to-Air Missile SAMA Step-by-step Automatic Message Accounting [Telephony] SAMPEX Solar Anomalous and Magnetospheric Particle EXplorer [Space] SAMTO Space And Missile Test Organization [Space] SAO Smithsonian Astrophysical Observatory [Space] SAP Second Audio Program SAP Service Access Point [OSI, Networking] SAR Search And Rescue SAR Synthetic Aperture Radar SARA Satellite pour Astronomie Radio Amateur [Space] SARA Stichting Academisch Rekencentrum Amsterdam (Amsterdam Universities Computing Center) SAREX Search and Rescue Exercise [Space] SAREX Shuttle Amateur Radio Experiment [Space] SARTS Switched Access Remote Test System SAS Small Astronomy Satellite SAS Space Activity Suit [Space] SASE Self-Addressed Stamped Envelope SASI Shugart Associates Systems Interface SAT Satellite [Space] SAW Surface Acoustic Wave SBA Small Business Administration SC Secondary Channel SC Sectional Center S&C Skull & Crossbones SC South Carolina S/C SpaceCraft [Space] SC SubCommittee SCA Shuttle Carrier Aircraft [Space] SCAD Subsonic Cruise Armed Decoy SCADC Standard Central Air Data Computer SCAME SCreen oriented Anti-Misery Editor SCAMP Single-Chip A-series Mainframe Processor SCAN Switched Circuit Automatic Network SCC Specialized Common Carriers SCC Switching Control Center SCCS Source Code Control System SCE Signal Conversion Equipment SCE Structure Chart Editor SCI SpaceCraft Incorporated SCIFI SCIence FIction (often used pejoratively of what really isn't) SCO Santa Cruz Operation SCOOPS SCheme Object Oriented Programming System SCOTS Surveilance and Control Of Transmission Systems SCSI Small Computer Systems Interface SCT Schmidt-Cassegrain Telescope [Space] SCUBA Self Contained Underwater Breathing Apparatus SCUD Subsonic Cruise Unarmed Decoy SD South Dakota SDB Source(?) DeBugger SDI Standard Disk Interconnect [DEC] SDI Strategic Defense Initiative [Space, US Government] SDIO Strategic Defense Initiative Organization [Space, US Government] SDLC Synchronous Data Link Control [IBM] SDM Sub-rate Data Multiplexer SDN Software Defined Network [Telephony, AT&T] SDN System Development Network (Korea) SDO Staff Duty Officer SDSC San Diego Supercomputer Center SDV Shuttle Derived Vehicle [Space] SE Service Engineer (see also CE, FE) SE South East SEATO SouthEast Asia Treaty Organization SEC Security Exchange Commission SECNAV SECretary of the NAVy SED Stream EDitor SEI Software Engineering Institute (Carnegie Mellon) SEI Space Exploration Initiative [Space] SEL Software Engineering Laboratory SEM Scanning Electron Microscope SEST Swedish-European Submillimeter Telescope [Space] SETI Search for Extra Terrestrial Intelligence [Space] SETI Search for ExtraTerrestrial Intelligence [Space] SF San Francisco SF Science Fiction; Speculative Fiction SF Standard Form SF Star Frontiers SFRPG Science Fiction Role Playing Game SG StarGuard SG SubGroup SGML Standard Generalized Markup Language SHAPE Supreme Headquarters Allied Powers Europe SHAR SHell ARchiver SHCD Sherlock Holmes Consulting Detective SHF Super High Frequency (3-30GHz) SHRPG Super Hero Role Playing Game SI Staten Island SIAM Society for Industrial and Applied Mathematics SID Sudden Ionospheric Disturbance [Space] SIG Special Interest Group SIGCAT Special Interest Group for Cd-rom Applications Technology SIMD Single Instruction, Multiple Data SIMM Single In-line Memory Module SIMM System Integrated Memory Module SINE SINE is not EINE SIPS Satellite Imagery Processing System SIR Shuttle Imaging Radar [Space] SIRTF Space (formerly Shuttle) InfraRed Telescope Facility [Space] SIRTF Space Infrared Telescope Facility [Space] SIS Strategic Information System SISCOM Satellite Information System COMpany SITA Societe Internationale Telecommunications Aeronautiques SJ Society of Jesus Skyhook Surface to space "elevator" transportation system [Space] SL Salvage Loss SL Space Launch [Space] SL SpaceLab [Space] SLA Special Libraries Association SLA Synchronous Line Adapter SLAC Stanford Linear Accelerator Center SLAN Sine Loco, Anno, (vel) Nomine (without place, year, or name) SLAR Side Looking Airborne Radar SLAR Side-Looking Airborne Radar [Space] SLBM Submarine Launched Ballistic Missiles SLC Space Launch Complex [Space] SLC Subscriber Loop Carrier [Telephony] SLDC Synchronous Data Link Control SLIP Serial Line Internet Protocol SLIP Serial Line IP (sometimes SL/IP) (see also PPP) SLP Super Long Play (VHS VCR) SLS Space(lab) Life Sciences [Space] SM Service Mark SMA Sergeant Major of the Army SMA Spectrum Manufacturers Association SMC Small Magellanic Cloud (see LMC) SMC Small Magellanic Cloud [Space] SMD Storage Module Device (interface standard for disk drives) SMD Surface Mounted Devices SMDR Station Message Detail Recording [Telephony] SMDS Switched Multi-megabit Data Service [Telephony, Networking] SME Solar Mesosphere Explorer [Space] SMEGMA Sophisticated Modern Editor with Gloriously Magnificent Abilities SMERSH Abbr. of Russian phrase meaning "Death to the spies." SMEX SMall EXplorers [Space] SMILS Sonobuoy Missile Impact Location System SMM Solar Maximum Mission (satellite 1980-1989) [Space] SMTP Simple Mail Transfer Protocol SMU Southeastern Massachusetts University SMU Southern Methodist University SN Science News [Periodical] SN Serial Number SN Super Nova SN SuperNova (e.g., SN1987A) [Space] SNA Systems Network Architecture [IBM] SNADS SNA Distribution Services SNAFU Situation Normal -- All Fouled Up (also more profane versions) SNAP Shipboard Non-tactical Automated data Processing program SNAP Sub Network Access Protocol [OSI, Networking] SNCF Societe National des Chemins de Fer (French National Railways) SNF Server-Natural Format SNMP Simple Network Management Protocol [TCP/IP] SNOBOL StriNg Oriented symbOLic Language SNPA SubNetwork Point of Attachment SNR Signal to Noise Ratio SNR Signal to Noise Ratio [Space] SNR SuperNova Remnant [Space] SNU Solar Neutrino Units [Space] SO Seller's Option SO Significant Other SO Space Opera SO Strike Out SOAP Symbolic Optimizing Assembler Program SOFIA Stratospheric Observatory For Infrared Astronomy [Space] SOH Start Of Header, ASCII control character (dec=01,control-A) SOHIO Standard Oil of oHIO [Corporate name] SOHO SOlar Heliospheric Observatory [Space] SOL Short on Landing (or, colloquially, Shit Out of Luck) SONAR SOund Detection And Ranging SONET Synchronous Optical Network [Telephony] SOP Standard Operating Procedure SOS Save Our Souls (International standard distress call, Morse ...---...) SOS Silicon On Sapphire SOS Son of Stopgap (editor) [DEC] SP Shore Patrol SP Short Play (VHS VCR) s.p. sine prole (Latin: without issue) [Genealogy] SP Southern Pacific [Corporate name, Railroading] SP Stack Pointer SP Star Patrol SPA Software Publishers Association SPAG Standards Promotion and Applications Group SPAN Space Physics and Analysis Network [NASA] (DECnet) SPAN Space Physics and Analysis Network [Space] SPAR Stock Points Adp Replacement SPARC Scalable Processor ARChitecture SPARC Standards, Planning, And Requirements Committee SPAWAR naval SPAce and WARfare command SPC Software Productivity Consortium SPCA Society for the Prevention of Cruelty to Animals SPCC Society for the Prevention of Cruelty to Children SPDM Special Purpose Dextrous Manipulator [Space] SPEC Systems Performance Evaluation Cooperative SPITBOL SPeedy ImplemenTation of snoBOL SPNI Society for the Protection of Nature in Israel SPOT Systeme Probatoire pour l'Observation de la Terre [Space] SPS Solar Power Satellite [Space] SPUR Systech Pluraxial Unplug Repeater SQE Signal Quality Error (IEEE 802.3, eqv to D/I/X "Collision Presence Test") [Ethernet] SQIID Simultaneous Quad Infrared Imaging Device (at NOAO) SQL Structured Query Language SQUID Superconducting QUantum Interference Device SRAM Short Range Attack Missile SRAM Static RAM SRB Solid (fuel) Rocket Booster [Space] SRG Short and Ring Ground (test) [Telephony] SRI Stanford Research Institute SRM Solid Rocket Motor [Space] SRO Standing Room Only SS7 Signalling System #7 [Telephony] SSA Social Security Administration [US Government] SSB Single Side Band SSC Superconducting Super Collider SSE South-SouthEast SSF Space Station Fred (er, Freedom) [Space] SSF Space Station Freedom [NASA, Space] SSFF Showcase Software Factory of the Future SSG Staff SerGeant SSI Small Scale Integration SSI Solid-State Imager (on Galileo) [Space] SSI Space Services Incorporated [Corporate name, Space] SSI Space Studies Institute [Space] SSI Supplemental Security Income SSME Space Shuttle Main Engine [Space] SSPF Space Station Processing Facility [Space] SSPS Satellite Solar Power Station [Space] SSR Secondary Surveillance Radar SSR Soviet Socialist Republic SSRMS Space Station Remote Manipulator System [Space] SST Spectroscopic Survey Telescope [Space] SST SuperSonic Transport [Space] SSTO Single Stage To Orbit [Space] SSTV Slow Scan TeleVision SSW South-SouthWest ST Short Ton STARS Software Technology for Adaptable, Reliable Systems STD Sacrae Theologiae Doctor (doctor of sacred theology) STD Sexually Transmitted Disease (replaces VD) STD State Transition Diagram STD Subscriber Trunk Dialing (British, and elsewhere; equiv. DDD in USA) STI Standard Tape Interconnect [DEC] STILO Scientific and Technical Intelligence Liaison Office STIS Space Telescope Imaging Spectrometer (to replace FOC and GHRS) [Space] STL St. Louis (airport designation) STN SuperTwisted Nematic STOL Short TakeOff and Landing STP Shielded Twisted Pair [Telecom, Networking] STP Software Through Pictures STP Standard Temperature and Pressure (see NTP) STRPG Star Trek: The Role-Playing Game STS Space Transportation System (space shuttle) [NASA] STScI Space Telescope Science Institute [Space] STV Single Transferable Vote STV Space Transfer Vehicle [Space] SUM Symantec Utilities for Macintosh SUN Stanford University Network SUN SUN MicroSystems Computer (not an Acronym) [Corporate name] SUNOCO SUN Oil COmpany [Corporate name] SUNY State University of New York SURAnet Southeastern Universities Research Association Network SVID System V Interface Definition SW South West SW SuperWorld SWAS Submillimeter Wave Astronomy Satellite [Space] SWBT South Western Bell Telephone [Telephony] SWF ShortWave Fading [Space] SWIFT Society for Worldwide Interbank Financial Communications SWS Scientific Workstation Support SXS Step by Step switching [Telephony] T Traveler T1 1.544Mbps [Telephony], one of the basic signalling systems 24x64Kb T3 45Mbps (eq 28 T1 channels) [Telephony] TA Teaching Assistant TAC Tactical Air Command (see SAC) TAC Terminal Access Controller [ARPANET/MILNET] (replaced TIP) TACACS Terminal Access Controller Access Control System [ARPANET/MILNET] TACCS Tactical Army Combat service support Computer System TAE Transportable Applications Environment TAL Trans-Atlantic Abort Landing [NASA, Shuttle] TAL Transatlantic Abort Landing (Shuttle abort plan) [Space] TANSTAAFL There Ain't No Such Thing As A Free Lunch TAR Tape ARchiver TASI Time Assign{ment,ed} Speech Interpolation [Telephony] TAU Thousand Astronomical Units [Space] TB TuBerculosis TBA To Be Announced TBD To Be Determined TBD To Be Done TC Teachers College TCA Terminal Controlled Airspace TCP Transmission Control Protocol TCP/IP Transmission Control Protocol/Internet Protocol TCS Thermal Control System [Space] TCSEC Trusted Computer System Evaluation Criteria (orange book) TCT To Challenge Tomorrow TD Tardive Dyskinesia TD TouchDown TD Treasury Department TDCC Transportation Data Coordinating Committee TDE Transition Diagram Editor TDI Trusted Database Interpretation TDM Time-Division Multiplexer TDR Time Domain Reflectometer TDRS Tracking and Data Relay Satellite [Space] TDRSS Tracking and Data Relay Satellite System [Space] TDY Temporary DutY TECO Tape Editor and COrrector TECO Text Editor and COrrector TEFLON polyTEtraFLuOrethyleNe TES Thermal Emission Spectrometer (on Mars Observer) [Space] TFP Tops Filing Protocol TFS Translucent File System TFT The Fantasy Trip TFT Thin Film Transistor TG Thieves' Guild TGV Tres Grande Vitesse (French, Very High Speed) [Railroading] TGV Two Guys and a VAX (humorous variant) [Corporate name] THIEF THief Isn't Even Fine THIEF This Here Isn't Even Fine THOR Tandy High-intensity Optical Recording TI Texas Instruments TIA Thanks In Advance [Net jargon] TIA Transient Ischemic Attack TIC TermInfo Compiler TID Ter In Die (three times a day) TID Transaction ID TIFF Tag Image File Format TIP Terminal Interface Processor [ARPANET/MILNET] (replaced by TAC) TIS Trusted Information Systems [Corporate name] TISN Tokyo International Science Network (Japan) TKO Technical Knock Out [Boxing] TL Total Loss TLA Three Letter Acronym TLC Tender Loving Care TLI Transort-Level Interface TM TradeMark TMA Tycho Magnetic Anomaly (movie 2001) TMAC Treasury department's Multiuser Acquisition Contract TMIS Telecommunications Management Information System TMO Telephone Money Order TMP The Morrow Project TMRC Tech Model Railroad Club [MIT] TMRC Transportation Modeling Research Center (TMRC {above} alter ego) TN Tennessee TN Twisted Nematic TNC Threaded Neill Concelman (connector) [Electronics] (see also BNC) TNF Tumor Necrosis Factor [Biology, Medicine] TNP Tech Nickel Plate (RR) [TMRC] TNT TriNitro Toluene TO Telegraph Office TO Turn Over TODS Transactions on Database Systems (ACM) TOMS Total Ozone Mapping Spectrometer [Space] TOMS Transactions on Mathematical Software (ACM) TOOIS Transactions on Office Information Systems (ACM) TOP Technical Office Protocol TOPLAS Transactions on Programming Languages and Systems (ACM) TOPS Traffic Operator Position System [Telephony] TOPSMP Traffic Operator Position System Multipurpose [Telephony] TORES Text ORiented Editing System TOS Transfer Orbit Stage [Space] TOW Tube launched, Optically tracked, and Wire guided TOY Time Of Year (clock) TP Transaction Processing TP Transport Protocol (ISO/CCITT Transport Services (TP0-TP4); like TCP) TP4 Transport Protocol, class 4 [ISO] TPC The Phone Company (from classic movie: _The President's Analyst_) TPI Tracks Per Inch TPO Traveling Post Office TPP TetraarylPorPhyrin TPS Technical Publishing Software TPS TeleProcessing Services TPS Thermal Protection System [Space] TR Tech Report (at least at LCS (q.v.), maybe others) TR Technical Reference [Bell, Telephony] TRG Tip and Ring Ground (test) [Telephony] TROFF Text RunOFF, text formatter TRUSIX TRUSted unIX TRW Thompson, Ramo, and Woolridge TS Top Secret TSAP Transport Service Access Point [OSI, Networking] TSD Total System Design TSP Teleprocessing Services Program TSP Thrift Savings Plan TSP Time Synchronization Protocol TSP TriSodium Phosphate TSR TSR (Fortune 500 Company that manufactures Dungeons & Dragons) TSS Tethered Satellite System [Space] TSTO Two Stage to Orbit [Space] T&T Tunnels & Trolls TTFN Tah Tah, For Now TTL Transistor Transistor Logic TTMA Tennessee Tech Microcomputer Association TTU Tennessee Technological University TTY TeleTYpe TUNIS Toronto UNIversity System TV TeleVision TVA Tennessee Valley Authority TW Thieves' World TWA Trans World Airlines [Corporate name] TWB Terrestrial WideBand [Networking, DARPA] TWIMC To Whom It May Concern TWT Traveling Wave Tube TWX TeletypeWriter eXchange TX Texas Tx Transmit u (representing the greek mu) - micro U Universe UA United Artists UAR United Arab Republic UAR User Action Routine UARS Upper Atmosphere Research Satellite [Space] UART Universal Asynchronous Receiver Transmitter UBA UniBus Adapter [DEC] UBC Universal Bibliographic Control UBC University of British Columbia UBM Unpressurized Berthing Mechanism [Space] UCAR University Corporation for Atmospheric Research UCB University of California at Berkeley UCD Uniform Call Distributor [Telephony] UCD University of California at Davis UCI University of California at Irvine UCL University College London UCLA University of California at Los Angeles UCR University of California at Riverside UCSB University of California at Santa Barbara UCSC University of California at Santa Cruz UCSD University of California at San Diego UCSF University of California at San Francisco UDB Unified DataBase UDMH Unsymmetrical DiMethyl Hydrazine [Space] UDP User Datagram Protocol UEC User Environment Component UFO Unidentified Flying Object [Space] UGC Uppsala General Catalog [Space] UH Upper Half UHF Ultra High Frequency (300-3000MHz) UID Unique IDentifier UID User IDentification [UNIX] UIMS User Interface Management System UIT Ultraviolet Imaging Telescope (Astro package) [Space] UIUC University of Illinois at Urbana-Champaign UK United Kingdom UKST United Kingdom Schmidt Telescope [Space] UL Underwriters Laboratory ULANA Unified Local-Area Network Architecture UMOC Ugliest Man On Campus [MIT] UMT Universal Military Training UN United Nations UNESCO United Nations Educational, Scientific, & Cultural Organization UNICEF United Nations International Children's Emergency Fund (now United Nat. Child. Fund) UNICS UNiplex Information Computer Services UNIX Not an acronym at all. Was a joke on MIT's MULTICS. UNMA Unified Network Management Architecture [AT&T] UNO United Nations Organization UP Union Pacific [Railroading, Corporate name] UPC Universal Product Code UPI United Press International UPI United Press International [Corporate name] UPS Uninterruptible Power Supply UPS United Parcel Service [Corporate name] UR University of Rochester URI University of Rhode Island US United States (of America) USA Union of South Africa USA United States Army USA United States of America USAF United States Air Force USAFA United States Air Force Academy (in Colorado Springs) USAN University Satellite Network USB Upper Side Band USC University of Southern California USCG United States Coast Guard USDA United States Department of Agriculture USES United States Employment Service USFL United States Football League USGS United States Geological Survey USIA United States Information Agency USM United States Mail USMC United States Marine Corps USMP United States Microgravity Payload [Space] USN United States Navy USO United Service Organizations USO Unix Software Operation USP United States Pharmacopeia USPS United States Postal Service USR User Service Routines USS United States Ship USSR Union of Soviet Socialist Republics USSS User Services and Systems Support USW Und So Weiter UT Universal Time (a.k.a. GMT, UTC, or Zulu Time) UT University of Tennessee UT University of Texas UT UTah UTC Coordinated Universal Time (a.k.a. UT) UTC Universal Coordinated Time (a.k.a. UT) UTnet University of Texas Network UTP Unshielded Twisted Pair [Telecom, Networking] UUCP UNIX-to-UNIX Copy Program UUG Unix User Group UV UltraViolet UVS UltraViolet Spectrometer UW UnderWriter UW Univ of Wisconsin VA Veterans Administration VA Virginia VAB Vehicle Assembly Building (formerly Vertical Assembly Building) [Space] VAFB Vandenberg Air Force Base [Space] VAN Value Added Network (e.g. Tymnet, Telenet, etc) VANS Value-Added Network Services VAR Value Added Remarketer (reseller) VASI Visual Approach Slope Indicator VAT Value Added Tax VAX Virtual Address eXtended VAXBI VAX Bus Interconnect VC Viet Cong VC Virtual Circuit Vcc Voltage (Common Cathode?) VCM Voice Coil Motor VCO Voltage Controlled Oscillator VCR VideoCassette Recorder VCU Virginia Commonwealth University VD Venereal Disease (see also STD) VDFM Virtual Disk File Manager VDI Virtual Device Interface VDM Vienna Development Method VDM Virtual Device Metafile VDT Video Display Terminal VEEGA Venus-Earth-Earth Gravity Assist (Galileo flight path) [Space] VF Video Frequency VF Voice Frequency VFO Variable Frequency Oscillator VFR Visual Flight Rules [Aviation] VFW Veterans of Foreign Wars VFW Volunteer Fire Department VG Very Good VG Vicar-General VGA Video Graphics Array Vgg Voltage (Gate to Ground?) V&H Vertical and Horizontal (CO coordinate tape) [Telephony] VHDL Vhsic Hardware Description Language VHF Very High Frequency (30-300MHz) VHS Video Home System (VCR) VHSIC Very High Speed Integrated Circuit VI VIsual editor VIABLE Vertical Installation Automation BaseLinE VILE VI Like Emacs VINE Vine Is Not Emacs VIP Very Important Person VISTA Volunteers In Service To America VITA Vme International Trade Association VJ Video Jockey VL Vulgar Latin VLA Very Large Array [Space] VLBA Very Long Baseline Array [Space] VLBI Very Long Baseline Interferometry [Space] VLF Very Low Frequency (3-30KHz) VLIW Very Long Instruction Word VLSI Very Large Scale Integration VLT Very Large Telescope [Space] VM Virtual Memory VM/CMS Virtual Machine/Conversational Monitor System VMM Virtual Memory Manager VMOS Vertical Metal Oxide Semiconductor (V-MOS) (see MOS) VMR Vertical Market Reseller VMS Vertical Motion Simulator [Space] VMS Virtual Memory System [DEC] VOA Voice Of America VOIR Venus Orbiting Imaging Radar (superseded by VRM) [Space] VOIS Voice-Operated Information System VOQ Visiting Officer's Quarters VPI&SU Virginia Polytechnic Institute and State University VRC Vertical Redundancy Character VRM Venus Radar Mapper (now called Magellan) [Space] VRM Virtual Resource Manager VSAT Very Small Aperture Terminal (satellite dish) VSX X/open Verification Suite VTAM Virtual Telecommunications Access Method [IBM] VTOC Volume Table Of Contents VTOL Vertical TakeOff and Landing VTR VideoTape Recorder VUP Vax Unit of Performance V&V Villains & Vigilantes VVSS Vertical Volute Spring Suspension W West W Width WA Washington WA Western Australia WAC Womens Air Corps WAIS Wide Area Information Server WARC World Administrative Conference WATS Wide Area Telephone Service WB Water Ballast WB WayBill WBC White Blood Cells WC Water Closet WC Without Charge WCTU Women's Christian Temperance Union WD White Dwarf [Space] w.d. will dated [Genealogy] WECo Western Electric Company [AT&T] (manufacturing arm of AT&T) WFPC Wide Field / Planetary Camera (on HST) [Space] WFPCII Replacement for WFPC [Space] WG Working Group WH WarHammer WHBL World Home Bible League WHCA White House Communications Agency [US Government] WHO World Health Organization WI Wisconsin WIMP Windows/Icons/Mouse Programming(?) WIPP (nuclear) Waste Isolation Pilot Plant [DOE] WIS WWMCCS Information System WITS Washington Interagency Telecommunications System WIYN Wisconsin / Indiana / Yale / NOAO telescope [Space] WMSCR Weather Message Switching Center Replacement WOM Write Only Memory WOP WithOut Papers [Immigration] WOPR War Operations Planned Response (from "Wargames" movie) WORM Write Once, Read Many times WOW Worlds of Wonder w.p. will proved [Genealogy] WP Word Processing WP Working Paper WPI Worcester Polytechnic Institute WSI Wafer Scale Integration WSMR White Sands Missile Range [Space] WSW West-SouthWest WTR Western Test Range [Space] WU Washington University WU Western Union WUPPE Wisconsin Ultraviolet PhotoPolarimter Experiment (Astro package) [Space] WV West Virginia WW World War WWI World War I WWII World War II WWMCCS World-Wide Military Command and Control System WY Wyoming WYSIWIS What You See Is What I See WYSIWYG What You See Is What You Get XCF eXperimental Computing Facility XD without Dividend XDR eXternal Data Representation XFER Transfer XINU XINU Is Not UNIX XL eXtra Large XMM X-ray Multi Mirror [Space] XMTR transMiTteR (the X is for trans) XNS Xerox Network Services XO eXecutive Officer XOR eXclusive OR (logical function) XPORT Transport XSECT cross SECTion XTAL crysTAL (another version of x for crys, see XMTR) XUI X-windows User Interface XUV eXtreme UltraViolet [Space] YA Yet Another YACC Yet Another Compiler Compiler YB YearBook YMCA Young Mens Christian Association YMHA Young Mens Hebrew Association YOB Year Of Birth YP Yellow Pages YRS Ysgarth Rules System YSO Young Stellar Object [Space] YST Yukon Standard Time YT Yukon Territory YT Yukon Time YTD Year To Date YWCA Young Womens Christian Association YWHA Young Womens Hebrew Association Z Zenith Z Zero Z Zulu (time) ZB Zero Beat ZETA Zero Energy Thermonuclear Assembly ZGS Zero Gradient Synchrotron ZI Zonal Index ZIF Zero Insertion Force (connector/socket) ZIP Zone Improvement Plan (US post office code) ZK barrage balloon (navy symbol) ZMRI Zinc Metals Research Institute ZPG Zero Population Growth ZPRSN Zurich Provisional Relative Sunspot Number ZST Zone Standard Time ZT Zone Time ZWEI Zwei Was Eine Initially