trigon

Meanings

1. A triangle.
2. An ancient triangular harp of Oriental origin which had four strings and was often used for banquet music. Also called sabbeka, sackbut, sambuca.
3. A division consisting of three star signs.
4. A trine; an aspect of two planets distant 120 degrees from each other.
5. An old ball game played by three people standing in a triangular formation. (See Wikipedia's entry for the game)
6. The cusp (cutting region) of the crown of an upper molar, usually the anterior part.

Etymology

From Ancient Greek τρίγωνον (trígōnon, “triangle”), neuter substantive of τρίγωνος (trígōnos, “three-sided”), from τρεῖς (treîs, “three”) + γωνία (gōnía, “bend, angle”). Equivalent to tri- + -gon. Doublet of trigone and trigonon.