trigon
Trigon (noun) means an ancient three-cornered harp from the East, with four strings, once used to play music at feasts, also called a sabbeka, sackbut or sambuca.
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.