Trigraph
# Trigraph

Trigraph may refer to:

## Computing

* Digraphs and trigraphs, a group of characters used to symbolise one character
* An octal or decimal representation of byte values
* Mnemonics for machine language instructions
* As language codes in ISO 639

## Cryptography

* As substitution group in a substitution cipher
* As combinations in the Ling Qi Jing

## Mathematics

* As a generalization of graphs where there is a set of edges called semi-adjacent

## Other uses

* Trigraph (orthography), a sound representation in orthography
