- a positively-charged particle consisting of a proton and two neutrons, equivalent to the nucleus of an atom of tritium.
- a son of Poseidon and Amphitrite, represented as having the head and trunk of a man and the tail of a fish, and as using a conch-shell trumpet.
- a moon of Neptune.
- any of various marine gastropods of the family Cymatiidae, having a large, spiral, often beautifully colored shell.
- the shell of a triton.
- any of various chiefly tropical marine gastropod molluscs of the genera Charonia, Cymatium, etc, having large beautifully-coloured spiral shells
- a nucleus of an atom of tritium, containing two neutrons and one proton
- a sea god, son of Poseidon and Amphitrite, depicted as having the upper parts of a man with a fish's tail and holding a trumpet made from a conch shell
- one of a class of minor sea deities
- the largest satellite of the planet Neptune. Diameter: 2700 km
