| Abbreviation | Definition |
|---|---|
| TIPC | Transparent Inter-Process Communication |
| TIQ | Tape INQuiry program |
| TIR | Total Indicated Runout |
| TIR | Transport International Routier |
| TIS | Terminal Indicate Secondary |
| TISR | Test Intersecting Storage Ring |
| TIX | Terminal Indicate additional channel X |
| TJN | Traffic Jam Network |
| TJR | Trunk and Junction Routing |
| TL | Transport Layer |
| TLA | Top Level Architecture |
| TLA | Transport Layer Architecture |
| TLI | Transport Layer Interface |
| TLI | Transport Level Interface |
| TLNM | The Luxury Network Madrid |
| TLS | Thread Local Storage |
| TLS | Transparent LAN (Local Area Network) service |
| TLS | Transport Layer Security |
| TLS | Transport Layer Service |
| TLS/SSL | Transport Layer Security/Secure Sockets Layer |