| Abbreviation | Definition |
|---|---|
| TTC | Toro Company |
| TTF | Thailand Fund, Inc. |
| TTI | Tetra Technologies, Inc., of Delaware |
| TTM | T T M Technologies, Inc. |
| TTM | TTM Technologies, Incorporated |
| TTN | Titan Corporation |
| TTR | 2002 Target Term Trust, Inc. |
| TTR | 2002 Target Term Trust, Incorporated (de-listed) |
| TTR | 2002 Target Term Trust, Incorporated (de-listed) |
| TUC | Mac- Gray Corporation |
| TUEPA | T X U Electric Company Preferred A |
| TUEPB | T X U Electric Company Preferred B |
| TUEPM | T X U Electric Company Preferred Capital I |
| TUEPN | T X U Electric Company Preferred Capital II |
| TUEPO | T X U Electric Company Preferred Capital III |
| TUG | Maritrans, Inc. |
| TUI | Transportation Components Index |
| TUP | Tupperware Corporation |
| TV | Grupo Televisa S. A. de C. V. |
| TVA | Tennessee Valley Authority |