Definitions
1.nounA polygon with three sides and three angles.
2.nounA set square.
3.nounA percussion instrument made by forming a metal rod into a triangular shape which is open at one angle. It is suspended from a string and hit with a metal bar to make a resonant sound.
4.noun(cue sports) A triangular piece of equipment used for gathering the balls into the formation required by the game being played.
5.nounA love triangle.
6.noun(systemics) The structure of systems composed with three interrelated objects.
7.nounA draughtsman's square in the form of a right-angled triangle.
8.nounA frame formed of three poles stuck in the ground and united at the top, to which people were bound when undergoing corporal punishment.
9.nounAny of various large papilionid butterflies of the genus Graphium.
10.nounA triangular formation of railway tracks, with a curve on at least one side.