Digraph (computing)
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Digraphs are two-character sequences used to enter single conceptual 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. Digraphs can also be used to extend the keyboard.
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.
SQL uses digraphs such as <=, >=, and <> to represent less than or equal, greater than or equal, and not equal.
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