The button on the keyboard with the open apple and Command symbol pictures on it.
The Apple Key (K) on the keyboard located next to the Space Bar. Pressed with other keys to perform special actions. Functionality is similar to that of the Control key on a Windows PC.
Also know as the Apple key, the command key is a key on the Apple Macintosh computer. It is used as a shortcut for common commands in a similar way to the Control (Ctrl) key on a PC.