transcription, транскрипция: [ ˈtrī-ˌgraf ]
noun
Date: circa 1836
1. : three letters spelling a single consonant, vowel, or diphthong
eau of beau is a trigraph
2. : a cluster of three successive letters
the, ion, and ing are high frequency trigraph s
• tri·graph·ic (ˌ)trī-ˈgra-fik adjective