Dictionary of Computer and Internet Terms: Command key
Command key
the key marked with a cloverleaf-like symbol () on the Macintosh. It is used like a shift key to change the meanings of other keys or to perform special functions. For example, you can print a picture of the current screen by holding down Command and Shift and pressing 4. If you press 3 instead, a picture of the current screen will be saved as a MacPaint document.