| Meaning | Category |
| Mac- Gray Corporation | Business->NYSE Symbols |
| TUCson, Arizona | Governmental->State & Local |
| Tentative Unique Contiguous | Academic & Science->Mathematics |
| The Universal Composer | Computing->Software |
| The Unsung Chronicles | Community->Music |
| Time Of Useful Consciousness | Medical->Physiology |
| Title Under Construction | Community->Media |
| Tokyo Union Church | Community->Religion |
| Toronto Ultimate Club | Community->Sports |
| Toucan Sam | Community->Famous |
| Trade Union Congress | Community->Media Governmental->United Nations |
| Trout Unlimited Canada | Community->Non-Profit Organizations |
| Tucuman, TU, Argentina | Regional->Airport Codes |
| Tung Chung, Hong Kong | Regional |
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