Tridents for fishing usually have barbed tines which trap the speared fish firmly. As a weapon, the trident was prized for its long reach. The trident is associated with Poseidon, the god of the sea in Greek mythology, the Roman god Neptune, and Shiva, a Hindu God who holds a trident in his hand. In Greek myth, Poseidon used his trident to create water sources in Greece and the horse. Poseidon, as well as being god of the sea, was also known as the "Earth Shaker" because when he struck the earth in anger he caused mighty earthquakes and he used his trident to stir up tidal waves, tsunamis and sea storms. In Roman myth, Neptune also used a trident to create new bodies of water and cause earthquakes.
[Middle English, from Old French, from Latin tridns, trident- : tri-, tri- + dns, tooth; see dent- in Indo-European roots.]