| Abbreviation | Definition |
|---|---|
| UAB | University of Alabama in Birmingham |
| UAP | Unidentified Aerial Phenomenon |
| UAPTF | Unidentified Aerial Phenomena Task Force |
| UAR | Upper Atmosphere Research |
| UARS | Upper Atmosphere Research Satellite |
| UB | Upper Brace |
| UB | Utility Bridge |
| UBE | Universal Bus Exerciser |
| UBIC | Universal Bus Interface Controller |
| UC | Unsatisfactory Condition |
| UCC | Universal Checkout Console |
| UCD | Urine Collection Device |
| UCN | Uniform Control Number |
| UCPU | Urine Collection and Pretreatment Unit |
| UCS | Unified Control System |
| UCS | Uniform Coding System |
| UCS | Universal Control System |
| UCS | Utilities Control System |
| UCTA | Urine Collection Transfer Assembly |
| UD | Update |