digraph

In linguistics, this term describes the visual representation of a single sound through two letters, such as the th in thin. It is a technical term used primarily in phonetics and orthography to explain the discrepancy between written symbols and spoken sounds.

In mathematics and computer science, the term refers to a directed graph. Here, the focus is on the orientation of the relationship between nodes, meaning the connection from point A to point B is distinct from the connection from B to A.