Meta key

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Sun keyboard with meta key (between space bar and Compose key)

The meta key is a modifier key on MIT keyboards, such as the Knight keyboard and space-cadet keyboard (where it is labeled “META”), Symbolics LISP machine keyboards (where it is labeled “META” or “Meta”), and on Sun Microsystems keyboards (where it is marked as a solid diamond “◆”).

The key is similar in function to the Macintosh's command key, which has the same location. On keyboards that lack it, the functionality of the meta key, if available at all, may be invoked by other keys such as the Alt key, the Windows key or the Esc key (as, for example, in Emacs).

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