| Abbreviation | Definition |
|---|---|
| U/S | UnderSection |
| UA | Underlying Asset |
| UA | Union Avoidance |
| UAD | Understand, Architect, Deploy |
| UAD | Undetermined Amount of Damage |
| UAG | Unmanned Aircraft General |
| UAW | United Auto Workers |
| UBD | Ultimate Board of Directors |
| UBG | Ultimate Bar Grap |
| UBG | Ultimate Bar Graph |
| UBGEA | Ultimate Bar Graph Engine Analyzer |
| UBI | Unified Business Identifier |
| UBI | Unified Business Investment |
| UBI | Universal Business Identifier |
| UBIT | Unrelated Business Income Tax |
| UBL | Unique Best Location |
| UBL | Universal Business Language |
| UBM | Unsolicited Bulk Mail |
| UBO | Unincorporated Business Organization |
| UBR | UDDI Business Registry |