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 |
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| U | Unknown | |
| U/S | Unserviceable | |
| UAM | Underwater-Air Missile | |
| UARS | Underwater Acoustic Recognition System | |
| UART | Universal Asynchronous Receiver-Transmitter | |
| UAV | Unmanned Aerial Vehicle | |
| UCE | Uncorrected Error | |
| UD | User Data | |
| UDC | Universal Decimal Classification | |
| UDOFT | Universal Digital Operational Flight Trainer | |
| UDP | User datagram Protocol | |
| UfI | Universities for Industry | |
| UHF | Ultra High Frequency | |
| UHSM | Ultra High Speed Machining | |
| UK | United Kingdom | |
| UKADGE | UK Air Defence Ground Environment | |
| UKADR | UK Air Defence Region | |
| UKAeF | UK Aerospace Forum | |
| UKRAOC | UK Regional Air Operations Centre | |
| UKTICM | UK Thermal Imager Common Module | |
| Unapp | Unapproved | |
| Unclass | Unclassified | |
| Unk | Unknown | |
| UOR | Urgent Operational Requirements | |
| UP | User Process | |
| Upd | Update | |
| UPS | Uniterruptible Power Supply | |
| URG | Underway Replenishment Group | |
| URS | SW | User Requirements Specification |
| URTS | User Requirement & Trials Section (HMS Mercury) | |
| USAF | United States Air Force | |
| USB | Universal Serial Bus | |
| USM | Underwater-Surface Missile | |
| USN | United States Navy | |
| USW | Ultra-Short Wave | |
| UT | Universal Time (Formerly GMT) | |
| UTE | Union Technique de l'Electricité | |
| UTM | Universal Transverse Mercator Grid | |
| UTMG | Universal Transverse Mercator (Grid) | |
| UUM | Underwater-Underwater Missile | |
| UUT | Unit Under Test | |
| UV | Ultra Violet | |
| UVL | Under Voltage Lockout | |
| UVT | Universal Virtual Terminal | |
| UW | Under Water | |
| Uway | Underway | |
| UWE | University of the West of England | |
| UWT | Under Water Telephone | |
| V/S | Visual Signalling | |
| V/UHF | Very/Ultra High Frequency | |
| Vac | Vacuum | |
| Var | Variable | |
| Varn | Variation | |
| VB | SW | Visual Basic |
| VC | Virtual Circuit | |
| VCI | Volatile Corrosion Inhibitor | |
| VCS | Versatile Console System | |
| VDDL | Virtual Data Definition Language | |
| VDI | Volume of Direct Interest | |
| VDS | Variable Depth Sonar | |
| VDU | Visual Display Unit | |
| VDU | Video (Visual) Display Unit | |
| VEB | Variable Elevation Beam Antenna | |
| VECTAC | Vectored Attack (ASW Aircraft/Helicopter) | |
| Veh | Vehicle | |
| Vel | Velocity | |
| Vert | Vertical | |
| VERTREP | Vertical Replenishment | |
| VF | Voice/Video Frequency | |
| VFO | Variable Frequency Oscillator | |
| VGA | Video Graphics Array | |
| VGA | Variable Gain Amplifier | |
| VH | Vertex Height/Vickers Hardness | |
| VHDL | VHSIC Hardware Description Language | |
| VHF | Very High Frequency | |
| VHSIC | Very High Speed Integrated Circuit | |
| VHSIC | Veyr High Speed Integrated Circuit | |
| VI | Volume Indicator | |
| Vis | Visual | |
| VL | Velocity Leader | |
| VLCC | Very Large Crude Carrier | |
| VLF | Very Low Frequency (below 30 KHz) | |
| VLR | Very Long Range | |
| VLSW | Vertical Launch Sea Wolf | |
| VME | Versa Module Europe | |
| VOI | Volume of Interest | |
| Vol | Volume | |
| vs | Versus | |
| VSG | Variable Speed Gear | |
| VSR | Very Short Range | |
| VSTOL | Vertical or Short Take Off and Landing | |
| VSW | Very Short Waves | |
| VTOL | Vertical Take-Off and Landing Aircraft | |
| VTP | Visual Target Push | |
| VTR | Video Tape Recorder | |
| W/K | Watch Keeper | |
| WA(A) | Weapon Active (Area) | |
| WA(SD) | Weapon Active (Self Defence) | |
| WAM | Window Addressable Memory | |
| WAN | Wide Area Network | |
| Warn | Warner | |
| WAVELL | Army C3 System | |
| WC | Weapon Control | |
| WCSS | Weapon Control Sub-system | |
| WD | Weapon Director | |
| WD(A/SD) | Weapon Deception (Area/Self Defence) | |
| WDA | Weapon Danger Area | |
| WDC | Weapon Direction and Control | |
| Wdw | Window | |
| Wdw Dp | Window Depth | |
| Wdw W | Window Width | |
| WDZ | Weapon Danger Zone | |
| WEAF | West of England Aerospace Forum | |
| WEMIT | Weapon Equipment Mutual Interference Trial | |
| WEO | Weapons Engineering Officer/Weapons Electrical Officer | |
| WEP | Weapon Entry PointIWeapon Effect Planning | |
| WESP | West of England Strategic Partnership | |
| WEZ | Weapon Effective Zone | |
| WF) | Aircraft Controller (Fighter) | |
| WG | Working Group | |
| Wk.stn | Workstation | |
| WL | Wavelength | |
| WM) | Able-Seaman (Missile) | |
| WO | Wireless OperatorIWrite Out | |
| WOE | Weight of Evidence | |
| WP | Warsaw Pact/Weather Permitting/Working Pressure | |
| WPM | Words Per Minute | |
| Wpn | Weapon | |
| WSA | Weapon System Automation | |
| WWMCCS | World Wide Military Command and Control System | |
| WWW | World-Wide Web | |
| WYSIWIG | What You See Is What You Get | |
| XBT | Extended Back Track/Expendable Bathythermograph | |
| Xdat | Velocity in X direction (E-W) | |
| XI-Band | 8.0-10.0 GHz Radar Band | |
| XMT | Exempt | |
| XS | Extra-Strong | |
| X-Wave | Extraordinary Wave (or Ray) | |
| Y dat | Velocity in Y direction (N-S) | |
| YP | Yield Point | |
| YS | Yield Strength | |
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