Trident

A trident (/ˈtraɪdənt/) is a three-pronged spear. It is used for spear fishing and historically as a polearm.

The trident is the tool of Poseidon (Greek) or Neptune (Roman) used for the protection of the sea realms, the god of the sea in classical mythology. Other sea deities such as Amphitrite or Triton were also often depicted with a trident in classical art. Later, tridents were used in medieval heraldry, sometimes held by a merman or triton. In Hinduism, it is the weapon of Shiva and is known as a trishula (Sanskrit for "triple-spear").