| Abbreviation | Definition |
|---|---|
| TTC | Telemetry Telecommand and Control |
| TTC | Trusted Telecom Cell |
| TTCL | Tanzania Telecommunication Company Limited |
| TTCL | Tanzania Telecommunications Company Limited |
| TTD | Temporary Transmit Delay |
| TTE | Telecommunications Terminal Equipment |
| TTFG | Telecommunications Technology Forecasting Group |
| TTG | Team Telecom Group |
| TTG | Test Tone Generator |
| TTGS | Test Tone Generator Software |
| TTIL | Team Telecom International Ltd |
| TTK | Telephone Travel Kit |
| TTM | Telecom Transport Management |
| TTP | Third-Party Provider |
| TTR | Touch Tone Required |
| TTS | Telephone Traffic Simulator |
| TTTN | Tandem Tie Trunk Network |
| TTX | TeleTeXt |
| TU | Total Usage |
| TUA | Telecommunications Users Association |