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A trigraph (from the Greek words tria = three and grapho = write) is a group of three symbols, most commonly letters.

Trigraphs are used in several fields, and for several purposes. Among them are:

In computing:
- As character representations in the C-family of programming languages.
- As octal or decimal representation of byte values.
- As trigrams in text matching.
In language:
- As language codes in ISO 639.
- As sound representations in orthography.
- As abbrevations.
In cryptography:
- As substitution group in a substitution cipher.
As combinations in the Ling Qi Jing.

Trigraph is also the name of several businesses.

This disambiguation page lists articles associated with the title Trigraph.
If an internal link led you here, you may wish to change the link to point directly to the intended article.

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 Trigraphs are used in several fields, and for several purposes. Among them are:
-* [[Trigraph (computer)|In computer science]]:
+* [[Trigraph (computing)|In computing]]:
 ** As [[C_trigraph|character representations]] in the [[C-family]] of programming languages.
 ** As [[octal]] or [[decimal]] representation of [[byte]] values.