- technetium, Tc, atomic number 43 - a crystalline metallic element not found in nature; occurs as one of the fission products of uranium
--1 is a kind of metallic element, metal
- Trusteeship Council, TC - a permanent council of the United Nations that commissions a country (or countries) to undertake the administration of a territory
--2 is a kind of council
--2 is a member of United Nations, UN