noun A 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.
noun A triangular piece of equipment used for gathering the balls into the formation required by the game being played.
noun A love triangle.
noun The structure of systems composed with three interrelated objects.
noun A draughtsman's square in the form of a right-angled triangle.
noun A frame formed of three poles stuck in the ground and united at the top, to which people were bound for corporal punishment.