Cerberus is a triple-barreled, triple-cylindered revolver, ornamented with scrollwork patterns, a small dog's head in place of the iron sights on each barrel, and a silver chain in the shape of a three-headed dog with a wing hanging from the end of the grip. Both the keychain and the gun itself are derived from Ancient Greek mythology, where Cerberus, the three-headed hellhound, guarded the gates to Hades's underworld.