What is the origin of trident?

Trident “a three-pronged instrument or weapon” derives from the Latin adjective tridēns “having/with three teeth” and is often associated with Neptune, known to the Greeks as Poseidon, the god of the sea and earthquakes. A similar symbol is the bident, a spear with two prongs, which was associated with Pluto, known to the Greeks as Hades, the god of the underworld. Trident’s two Latin sources, trēs and dēns (stem dent-), are cognates of their respective English translations three and tooth. A common trend in the Indo-European language family is for t in Latin to correspond to th in native English words, and this pattern is also visible when comparing Latin frāter, māter, and pater to English brother, mother, and father. Trident was first recorded in English in the late 1500s.