| Abbreviation | Definition |
|---|---|
| TS | Terribly Scarce |
| TS | Theosophical Society |
| TS2 | The Sims 2 |
| TSC | The Skull Collectors |
| TSCA | Traditional Small Craft Association |
| TSCC | Triad Sports Car Club |
| TTFF | Tahoe Truckee Fly Fishers |
| TTHA | Texas Trophy Hunters Association |
| TTORA | Toyota Territory Off-Road Association |
| TTT | Time-to-time |
| TTYC | Tegernsee Touring Yacht Club |
| TWD | Thad's World Destruction |
| TWP | Temporary White Pipe |
| TWR | Turkish Windsurf Riviera |
| TWT | Two Wheel Tuesday |
| TY | Type |
| TYMC | Teesside Yesteryear Motor Club |
| U | Uncommon |
| UAW | Ultimate Anime Worshipper |
| UBD | United Beer Drinkers |