| Abbreviation | Definition |
|---|---|
| TIS | Travelers Information Station |
| TIS | Trougher Impact System |
| TISR | Turkish International Ship Registry |
| TITI | Turbine Inlet Temperature Indicator |
| TITIP | Treasure Island Transportation Implementation Plan |
| TITS | The Treasure Island Transit Service |
| TITS | Treasure Island Transit Service |
| TIUS | Truck Inventory and Use Survey |
| TIV | Tornado Intercept Vehicle |
| TIV | Tornado Intercepting Vehicle |
| TJ | Temporary Jeep |
| TJ | Today's Jeep |
| TJ | Trail Jeep |
| TJ | True Jeep |
| TJ | Tuner Jeep |
| TJN | Traffic Jam Network |
| TJPA | Transbay Joint Powers Authority |
| TK | Confirmed Ticketed |
| TK | Too Klunky |
| TKH | Twinnie, Ken73, & HerrL83 crossfire injection system |