| Meaning | Category |
| Tank Thermal Sight | Governmental->Military Governmental->United Nations Governmental->US Government |
| Target Tracking System | Governmental->Military |
| Tarsal Tunnel Syndrome | Medical->Physiology |
| Technology Transfer Setting | Governmental->Military |
| Telephone Traffic Simulator | Computing->Telecom |
| Temporary Threshold Shift | Academic & Science->Electronics |
| Terrorist Training School | Governmental->FBI Files |
| Text To Speech | Computing->General |
| The Turbo Shop | Business->Firms |
| Ticket Tracking System | Community->Law |
| Track Transit System | Governmental->Transportation |
| Transdermal Therapeutic Safety | Medical->Physiology |
| Transdermal Therapeutic System | Medical->Oncology |
| Transit Time Spread | Governmental->Transportation |
| Transport Tycoon Superdeluxe | Governmental->Transportation |
| Trial Timing Scheme | Community->Sports |
| Trouble Ticket System | Computing->General |
| Tsaratanana, Madagascar | Regional->Airport Codes |
| Tumour Targeted Superantigens | Medical->Oncology |
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