Template:Sister project Trigraph may refer to:
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- Trigraph (orthography), a combination of written letters used to represent a sound
ComputingEdit
- Digraphs and trigraphs (programming), 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
CryptographyEdit
- As substitution group in a substitution cipher
- As combinations in the Ling Qi Jing
MathematicsEdit
- As a generalization of graphs where there is a set of edges called semi-adjacent