WordNet (r) 3.0 (2006):

Tc
    n 1: a crystalline metallic element not found in nature; occurs
         as one of the fission products of uranium [syn:
         technetium, Tc, atomic number 43]
    2: a permanent council of the United Nations that commissions a
       country (or countries) to undertake the administration of a
       territory [syn: Trusteeship Council, TC]

The Free On-line Dictionary of Computing (19 January 2023):

tc

    The country code for the Turks and Caicos
   Islands.

   (1999-01-27)