| | gitmo | | US Naval Base Guantanamo Bay |
| | ons | | us |
| | spIM | | Unsolicited commercial messages in instant messaging |
| | tnt | | until next time |
| | U.G.V | | Unmanned Ground Vehicles |
| | U.G.V. | | Unmanned Ground Vehicles |
| | U.L.C.P.C. | | ultra low-cost personal computer |
| | U.M.F. | | Unique Manuka Factor |
| | U.N. | | United Nations |
| | U.N.C.L.E. | | United Network Command for Law and Enforcement |
| | U.S. | | United States |
| | u.s.b.c.a | | until something better comes along |
| | u.s.b.c.a. | | until something better comes along |
| | U.T.G. | | under the gun |
| | UAE | | United Arab Emirates |
| | UAE | | Unrecoverable Application Error |
| | UART | | Universal Asynchronous Receiver-Transmitter |
| | UATOAB | | Useless as Tits on a Bull |
| | uav | | unmanned aerial vehicle |
| | UAVP | | Universal Aerial Video Platform |
| | UAVs | | Unmanned Aerial Vehicles |
| | UAY | | Upset at you! |
| | UBD | | User Brain Damage |
| | UBE | | unsolicited bulk e-mail |
| | UBE | | unsolicited bulk email |
| | UBS | | Unbundled Bitstream Service |
| | UBS | | Unique Buying State |
| | UCC | | Uniform Commercial Code |
| | ucla | | University of California, Los Angeles |
| | ucol | | Universal College of Learning |
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