- triangle, trigon, trilateral - a three-sided polygon
--1 is a kind of polygon, polygonal shape
--1 has particulars: - triplicity, trigon - (astrology) one of four groups of the zodiac where each group consists of three signs separated from each other by 120 degrees
--2 is a kind of trio, triad, triplet
- trigon - a triangular lyre of ancient Greece and Rome
--3 is a kind of lyre