Digraph (computing)

Digraphs are two-character sequences used to enter single characters that cannot be entered from the computer keyboard for various reasons: obsolete keyboard, input of special characters is required, the text editor reserves some characters for special use, etc.

Different systems have different sets of defined digraphs.

• C programming language supports digraphs in ISO C 94 mode of compiling.
• Vim text editor uses digraphs.
• GNU Screen has a digraph command, bound to ^A ^V by default.