trigraph

noun

1. A specific sequence of three letters, especially one used collectively to represent a single phoneme.

   “The letter “i” is pronounced as /aɪ/ when followed by the trigraph “ght”, as in right /raɪt/.”

   “Then, practice reading fluency sentences together that contain words with trigraphs and other mastered words.”

2. A three-character sequence used to enter a single conceptual character.

   “These new features are charizing, stringization, token concatenation, string concatenation, trigraph replacement, and predefined macros.”