| Abbreviation | Definition |
|---|---|
| TPY | Tipperary Corporation |
| TQY | Tanqueray Resources Ltd. |
| TQY | Tanqueray Resources, LTD. |
| TRT | Trio Technology International |
| TRV | Thousand Trails, Inc., of Delaware |
| TSC | Stephan Company |
| TSH | Teche Holding Company |
| TSR | Thermo Sentron, Inc. |
| TST | Media Logic, Inc. |
| TTE | Autotote Corporation |
| TTG | Tutogen Medical, Inc. |
| TTH | Telecom Holders Trust |
| TTP | Titan Pharmaceuticals, Inc., of Delaware |
| TTT | Thermo Terratech, Inc. |
| TTV | CableTel Communications Corporation |
| TWA | Trans World Airlines, Inc. |
| TWH | Allied Healthcare International (formerly TransWorld Healthcare, Inc.) |
| TWL | Targets Trust III |
| TXB | Texas Biotechnology Corporation |
| TXM | Trex Medical Corporation |