Tri Cobalt Torpedoes
Also known as a tricobalt charge or tricobalt warhead was a type of tricobalt explosive device utilized as a missile. Tricobalt devices were not standard issue weapons on Starfleet starships, but were sometimes carried in addition to photon torpedoes. The yield of tricobalt device is 10,000 teracochranes.
- Tricobalt Devices at Memory Alpha