| Meaning | Category |
| TRICARE Support Office | Governmental->US Government |
| Tactical Support Operations | Governmental->Military |
| Tactical Systems Officer | Governmental->Military |
| Taxpayer Service Office | Governmental->US Government |
| Team Support Officer | Business->Positions |
| Technical Service Order | Governmental->Military |
| Technical Staff Officer | Governmental->Military |
| Technical Standard Order | Governmental->Transportation |
| Technical Standards Order | Governmental->Military Governmental->NASA |
| Terminal System Operation | Computing->General |
| Tesoro Petroleum Corporation | Business->NYSE Symbols |
| The Seraphim Order | Community->Media |
| The Sims Online | Internet |
| Time Sharing Option | Governmental->Military Computing->Networking Computing->General |
| Time Spent Online | Business->General |
| Top Secret Organization | Governmental->Military |
| Transmission System Operator | Business->Positions |
| Tresco, Isles of Scilly | Regional->Airport Codes |
| Tsonga | Regional->Language Codes (3 Letters) |
| Type Standardization Orders | Governmental->Military |
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