| Abbreviation | Definition |
|---|---|
| UQO | Unacceptable Quality of Output |
| UQP | User's Questions Procedure |
| UQT | User's Question Time |
| UQX | UNIX Query eXchange |
| UR | Unit Record |
| URA | Ultimate Reboot Award |
| URA | Ultimate Reboot Awards |
| URI | Uniform Resource Identifier |
| URI | User Related Information |
| URL | Uniform Registration Language |
| URM | Universal Register Machine |
| URM | User Reference Memorandum |
| URN | User Requirements Notation |
| URQ | Un- Registration Request |
| URS | User Request Services |
| URS | User Requirement Specification |
| US | Unit Separator |
| USAG | Unix System Administrators Group |
| USAISEC | United States Army Information Systems Engineering Command |
| USB | Unusually supportive bum |