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- (metrology) Symbol for the teracoulomb, an SI unit of electric charge equal to 1012 coulombs.
- The ISO 3166-1 two-letter (alpha-2) code for Turks and Caicos Islands.
- (Internet) Topic closed. Used in Internet forums to announce that a topic thread is locked, indicating that no further replies are allowed in that topic thread.
- (electronics) Time counter.
- (electronics) thermocouple.
- Take care.
- Traffic collision.
- Initialism of ., Turkish Republic.