A kind of scepter or spear with three prongs, -- the common attribute of Neptune.

A three-pronged spear or goad, used for urging horses; also, the weapon used by one class of gladiators.

A three-pronged fish spear.

A curve of third order, having three infinite branches in one direction and a fourth infinite branch in the opposite direction.

U.S.-British conference in Washington, May 1943

a model of nuclear-powered submarine carrying ICBM missiles

American/British missile system (see Trident section).

Trident Cars Ltd was a British car manufacturer based originally in Woodbridge then in Ipswich, Suffolk between 1966 and 1974 and again after being restarted in 1976 from premises in Ipswich. The new company stopped production in 1977-78.