Physalia physalis, a marine cnidarian consisting of a floating colony of hydrozoans attached to a float, superficially resembling a jellyfish.
Used other than figuratively or idiomatically: see Portuguese, man-of-war.
Any of various large papilionid butterflies of the genus Graphium.
A set square.
The structure of systems composed with three interrelated objects.
A triangular piece of equipment used for gathering the balls into the formation required by the game being played.
A draughtsman's square in the form of a right-angled triangle.
A polygon with three sides and three angles.
A love triangle.
A triangular formation of railway tracks, with a curve on at least one side.
A frame formed of three poles stuck in the ground and united at the top, to which people were bound when undergoing corporal punishment.
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.