| Abbreviation | Definition |
|---|---|
| UCR | Universal Console Redirect |
| UCS | Universal Classification Standard |
| UDA | Unified Driver Architecture |
| UDB | Universal Desktop Box |
| UDD | Ultra DigiDrive |
| UDD | Ultrafast DigiDrive |
| UDD | User Defined Device |
| UDD | User-Data Disk |
| UDF | Upper Document Feeder |
| UDH | Universal Digital Housing |
| UDI | Unified Display Interface |
| UDI | Unique Device Identifier |
| UDL | Up DataLink |
| UDMA/33 | Ultra Direct Memory Access/33 |
| UDO | Ultra Density Optical storage |
| UDTX | Universal Data Transceiver |
| UEPO | Unit Emergency Power Off |
| UF | Usable Feeder |
| UFBGA | Ultra Fine Ball Grid Array |
| UFC | Ultra-Fast Ceramic |