| Acronym | Meaning |
| T | Telephone |
| T | Trainer (US military aircraft designation; as in T-1 Seastar) |
| T | Draft (naval architecture; waterline height) |
| T | Tactics |
| T | Tango (aviation letter code) |
| T | Taxe (French: tax; postage due mark; philately) |
| T | Tracer element (US military ammunition) |
| T | Treasury (various organizations) |
| T | Trillion |
| T | True Bearing |
| T | US Telegraph (Scott Catalogue prefix; philately) |