| Abbreviation | Definition |
|---|---|
| TYP | Typhoon |
| TYPOE | Ten Year (federal) Plan for Ocean Exploration |
| UAAS | Underwater Acoustic Analysis System |
| UARP | Upper Atmospheric Research Program |
| UARS | Upper Atmosphere Research Satellite |
| UCM | Unresolved Complex Mixture |
| UDID | Unique Data Item Description |
| UGF | Undergravel Filterplate |
| UGI | Union Géographique Internationale |
| UGJ | Under-Gravel Jet |
| UGW | UMTRA Ground Water |
| UGW | Uranium GroundWater Return |
| UH | Unit Hydrograph |
| UH | University of Hawaii, Honolulu |
| UHMS | Undersea & Hyperbaric Medicine Society |
| UHSLC | University of Hawaii Sea Level Center |
| UJÍT | Upper Johannesburg Institute Thermodynamics |
| UJNR | United States- Japan Cooperative Program in Natural Resources |
| UJT | Underwater Job Training |
| UKMO | United Kingdom Meteorological Office |