A trigonon (trígōnon, from Greek "τρίγωνον", "triangle") is a small triangular ancient Greek harp occasionally used by the ancient Greeks and probably derived from Assyria or Egypt. The trigonon is thought to be either a variety of the sambuca or identical with it. * Image with harp considered possible trigonon in the Grove New Encyclopedia of Musical Instruments. * Varieties of the great lyre or phorminx; Number 2 is the trigonon. (1812). (center top) In the collection of the New York Public Library.