| Abbreviation | Definition |
|---|---|
| TYH | Triangle Youth Hockey |
| TYH | Tullahoma Youth Hockey |
| TYHNC | Triangle Youth Hockey - North Carolina |
| TYS | Thomaston Youth Soccer |
| TYS | Torrington Youth Soccer |
| TYS | Track Your Stats |
| TYW | The Yacht Week |
| TZC | Toronto Zen Centre |
| TZD | Trance. Zen. Dance |
| TZG | Tidewater Zen Group |
| TZW | ThunderZone Wrestling |
| U | Ultimate |
| U | Undefeated |
| U | United |
| U | Unofficial |
| U10 | Under 10 League |
| UA | Ultimate Adventure |
| UA | Unreal Annihilation |
| UAA | University Athletic Association, Inc. |
| UAAI | University Athletic Association, Inc. |