τριαγμός

A. the triad or the triads, a philos. work by Ion of Chios, Harp. s.v. Ἴων, cf. D.L. 8.8, Clem.Al. Strom. 1.21. 131 (where τριαγμοῖς is restored for τριγράμμοις); τριασμοί Suid. s.v. Ὀρφεύς.