(n.) Two signs or characters combined to express a single articulated sound; as ea in head, or th in bath.
Example Sentences:
(1) The results from both these test systems are displayed in directed graph form and these digraphs (directed graph) show marked asymmetry in both young and old.
(2) Since nervous systems are representable by graphs or better with special digraphs, the networks, it follows that the brains are asymmetric in a strong sense according to which all cells are distinguishable from each other alone by their internal connections.