| Abbreviation | Definition |
|---|---|
| UTF-16 | 16-bit Unicode Transformation Format |
| UTF-8 | 8-bit Unicode Transformation Format |
| UTFC | Universal Tibetan Font Converter |
| UTI | Universal Transport Interface |
| UTP | Unifying Theories of Programming |
| UTSI | UnderTow Software, Inc. |
| UUC | Underground Upgrade Club |
| UUI | Universal USB Installer |
| UUI | User Update Interface Tool |
| UUO | Unimplemented User Operation |
| UV | User Variable |
| UVF | UGL Vector Font |
| UVO | Universal Virtual Office |
| UVT | McAfee VirusScan for Unix |
| UVU | Ultimate V U (Win) |
| UWIN | UNIX for WINdows |
| UWM | Unusable Window Manager |
| UWQ | Universal Work Queue |
| UWT | Ultimate Windows Tweaker |
| UX | Unix |