The Command key (⌘), also historically known as the Apple key, clover key, open-Apple key, pretzel key, propeller key, squiggly button, the quad button, or meta key, is a modifier key present on Apple keyboards. The Command key's purpose is to allow the user to enter keyboard commands in applications and in the system. An "extended" Macintosh keyboard — the most common type — has two command keys, one on each side of the space bar; some compact keyboards have one only on the left.
The "⌘" symbol (the "looped square") was chosen after Steve Jobs decided that the use of the Apple logo in the menu...