digraph

noun

Etymology: From Ancient Greek δίς (dís, “double”) + γράφω (gráphō, “write”), equivalent to di- + -graph.

1. A two-character sequence used to enter a single conceptual character.
2. 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.”

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