IPA: /ˈdaɪɡræf/
KK: /ˈdaɪɡræf/
A combination of two letters that together represent one sound in speech, like 'ph' in 'pheasant' or 'ea' in 'beat'.
In the word 'ship', the 'sh' is a digraph that makes a single sound.
Digraph → It is formed from "di-" (meaning two) and "graph" (from Greek "grapho", meaning to write). The word "digraph" refers to a pair of letters that together represent a single sound or phoneme in writing.
Think of 'two' ('di-') letters that 'write' ('graph') a single sound together — that's what a digraph is.