Photon torpedo

A photon torpedo was a type of torpedo weapon fielded by many species in the galaxy.

Starfleet used photon torpedo casings as coffins. 

In the 2370s, the Type-II was the standard photon torpedo used by Starfleet and had a yield of 18.5 isotons. The Type-IX was nearly as common as the type II but had a higher yield of 25 isotons. Some models, such as the advanced Type-VI could have a yield as high as 200 isotons.