| Abbreviation | Definition |
|---|---|
| TAP | Tap Oil, LTD. |
| TAS | Tasman Resources NL |
| TASOB | Tasman Resources Ltd |
| TAU | Trustees Australia Limited |
| TAW | Tawana Resources NL |
| TBR | Tribune Resources NL |
| TCL | Transurban Group |
| TCLKOA | Transurban Group |
| TCLKRR | Transurban Group |
| TCM | Tiaro Coal Ltd |
| TCN | Techniche Ltd |
| TCO | Transmetro Corporation Ltd |
| TCQ | Trinity Consolidated Group |
| TDI | Tidewater Investments Ltd |
| TDO | 3D Oil Ltd |
| TDO | 3D Oil, LTD. |
| TDX | TDX |
| TDXO | Tyrian Diagnostics Limited |
| TEG | Triangle Energy (global) Limited |
| TEL | Telecom Corporation of NZ Ltd |