Why was ⌘ used as the command key on Apple computers, why not the Apple logo? I was just curious about the command key, a little thing that seems to have been used for quite a long time.

Is there any particular reason that the founders of Apple decided to use the ⌘ symbol, not the Apple logo (like Windows does on their keyboards) as the Command Key? Just to clarify, I want the reasons why the designers chose it, and not personal opinion. Thanks!
From the Wikipedia entry on the Command Key:


  The "⌘" symbol (the "looped square") was chosen by Susan Kare after Steve Jobs decided that the use of the Apple logo in the menu system (where the keyboard shortcuts are displayed) would be an over-use of the logo.


It is also interesting that the ⌘ is not something Apple came up with. It is actually an ancient symbol called looped square.