digraph

A directed graph.

A two-character sequence used to enter a single conceptual character.

A pair of letters, especially a pair representing a single phoneme.

As a special education teacher, I find that introducing one or two digraphs a week works well.

A consonant digraph is a combination of two consonants that represent one sound.

a sequence of two lines, each of which may be unbroken, broken once, or broken twice.