| Acronym | Meaning |
![](file.png) | UNBAL | Unbalance |
![](file.png) | UNDK | Undock |
![](file.png) | UNDV | Undervoltage |
![](file.png) | UNIV | Universal |
![](file.png) | UNLCH | Unlatch |
![](file.png) | UNLK | Unlock |
![](file.png) | UP | Upper |
![](file.png) | UPLK | Uplink |
![](file.png) | UPP | User Parameter Processing |
![](file.png) | UPS | Uninterruptible Power Supply |
![](file.png) | UPS | Uninterruptible Power System |
![](file.png) | UPS | Upright Perigee Stage |
![](file.png) | UPTLM | UPlink Telemetry |
![](file.png) | UR | Unsatisfactory Report |
![](file.png) | UR | Upper Right |
![](file.png) | URA | Urine Receptacle Assembly |
![](file.png) | URN | Urine |
![](file.png) | URT | Upright |
![](file.png) | US | United States |
![](file.png) | US | Upper Stage |
![](file.png) | USA | United States Of America |
![](file.png) | USAF | United States Air Force |
![](file.png) | USB | Unified S-Band |
![](file.png) | USB | Upper Side Band |
![](file.png) | USBE | Unified S-Band Equipment |
![](file.png) | USBI | United Space Booster |
![](file.png) | USBS | Unified S-Band System (Subsystem) |
![](file.png) | USEC | Microsecond |
![](file.png) | USI | Update Software Identity |
![](file.png) | USN | United States Navy |
![](file.png) | USNS | United States Navy Ship |
![](file.png) | USRA | Universities Space Research Association |
![](file.png) | USS | United States Ship |
![](file.png) | USS | United States Standard |
![](file.png) | USS | Utility Support Structure |
![](file.png) | UST | United States Testing (Company) |
![](file.png) | UST | Universal Servicing Tool |
![](file.png) | UT | Umbilical Tower |
![](file.png) | UT | Unit Tester |
![](file.png) | UT | Universal Time |
![](file.png) | UT&GS | Uplink Text And Graphics System |
![](file.png) | UTC | Coordinated Universal Time |
![](file.png) | UTC | Unit Test Cases |
![](file.png) | UTC | United Technology Center |
![](file.png) | UTC | Universal Test Console |
![](file.png) | UTE | Universal Test Equipment |
![](file.png) | UTI | LUtility |
![](file.png) | UTLM | Up Telemetry |
![](file.png) | UTS | Urine Transfer System |
![](file.png) | UU | Micromicron |