Final answer:
The MAC Command key symbol represents a computer command and is illustrated by a looped square (⌘) next to the space bar on a MAC keyboard.
Step-by-step explanation:
The MAC Command key symbol is associated with option 'c' - Symbol for computer command. On Apple computers, specifically those made by MAC, the Command key is used to initiate computer commands in conjunction with other keys. It is often depicted with a looped square symbol (⌘) and is located on the keyboard next to the space bar. It is used for various shortcuts and functions within the macOS, like 'Command-S' for the 'Save' command.