| Abbreviation | Definition |
|---|---|
| UFO | USB Firewire Organizer |
| UFQ | User Fair Queuing |
| UFS | Universal Frame Standard |
| UFS | Unnumbered Frames State |
| UGA | User Global Area |
| UGM | Universal Gateway Manager |
| UGN | User Group Network |
| UGS | Unsolicited Grant Service |
| UGW | Universal GateWay |
| UI | Uniform Interface |
| UI | User Infrastructure |
| UI | UX Design |
| UIB | User Is Blocked |
| UIB | Utility Integration Bus |
| UIC | Universal Information Client |
| UIL | Unified Invocation Layer |
| UIL | User Interface Layer |
| UIN | Unimobile Intelligent Network |
| UIN | User Intelligent Network |
| UIP | Unique Internet Protocol address |