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A compose key (sometimes called multi key) is a key on a computer keyboard that indicates that the following (usually 2 or more) keystrokes trigger the insertion of an alternate character, typically a precomposed character or a symbol.
For instance, typing Compose followed by ~ and then n will insert ñ.
Compose keys are most popular on Linux and other systems using the X Window System, but software exists to implement them on Windows and macOS.