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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

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