| Abbreviation | Definition |
|---|---|
| TSTD | Time Switched Transmit Diversity |
| TSU | Touch Screen Unit |
| TTAC | Technical Testing and Analysis Center |
| TTC | Total Transfer Capacity |
| TTE | Tallahassee Telephone Exchange |
| TTL | Time To Last |
| TTM | Tracked Target Message |
| TTP | Time Triggered Protocol |
| TTP | Trivial Transport Protocol |
| TTR | Talkgroup Trunked Recording |
| TTU | Test & Turn Up |
| TUG | Timeshare Users Group |
| TUG | Tributary Unit Group |
| TUS | The Unicode Standard |
| TVR | The Virtual Repository |
| TVS | Transactional Vsam Services |
| TWA | Technical Web Administration |
| TWIG | The Web Information Gateway |
| TWNIC | Taiwan Network Information Center |
| TWS | Tiny Web Server |