| Abbreviation | Definition |
|---|---|
| UAX-9 | Unicode standard AnneX 9 |
| UB | Universal Binary |
| UBE | Universal Batch Engine |
| UBH | Usenet Binary Harvester |
| UBJ | Universal Binary JSON |
| UBK | UULug Beowulf Kit |
| U-BOOT | Universal Boot Loader |
| UBPA | Uncoupled Bilinear Programming Algorithm |
| UC | Under Construction |
| UC | Universal Control |
| UC | Upper Case |
| UCCX | Unified Contact Center Express |
| UCG | Unified Code Generation |
| UCI | Universal Chess Interface |
| UCI | User Class Identifier |
| UCI | User Command Interface |
| UCL | Useful Coding Lines |
| UCM | Unified Change Management |
| UCM | Use Case Map |
| UCPD | UNESCO Country Programming Documents |