| Abbreviation | Definition |
|---|---|
| TYS | Train Yard Software |
| TYT | Tae Young Telstar |
| TYT | TrackYourTruck Vehicle Tracking |
| TYW | Tile Your World |
| TYX | Tylox Resources Corporation |
| TYZ | Two Yellow Zebras |
| TZ | Travel Zippy |
| TZA | Tom Zosel Associates |
| TZB | The Zen Barons |
| TZC | The Zack Company, Inc. |
| TZC | The Zealia Corporation |
| TZC | The Zenon Corporation |
| TZC | TZ Corporation |
| TZCI | The Zack Company, Inc. |
| TZD | Timothy Zach Design |
| TZD | Turbo Zone Direct |
| TZG | The Zellman Group |
| TZG | The ZeroFault Group |
| TZG | The Zitelman Group |
| TZG | The Zitter Group |