A thing with three components; a set of three things.
Any of various seabirds of the subfamily Sternidae (of the family Laridae) that are similar to gulls but are smaller and have a forked tail.
Consisting of three components; ternate, threefold, triple.
A symbol having the shape of such leaves, especially when used as an architectural ornament.
Any of several plants of the pea family, having compound, trifoliate leaves; especially one of the genus Trifolium.