trigram

plural trigrams

1. human sciencesA trigraph, a sequence of three letters representing one phoneme.
2. computationalAn n-gram consisting of three items from a sequence.

   In fact, half of all such words for this corpus are initiated by only 39 different trigrams!

   1974, Edward C. Carterette, Margaret Hubbard Jones, Informal Speech: Alphabetic & Phonemic Texts with Statistical Analyses and Tables, University of California Press, →ISBN, page 44

3. divinationAny of the eight combinations of three complete or broken lines forming half of a hexagram in Chinese system of divination I Ching.