Sun keyboards had a diamond to mark that key, which is better to my mind than a third party commercial OS logo.
I wouldn't even mind if it was the keyboard manufacturer logo.
[0]: https://deskthority.net/wiki/File:Suntype7sf.jpg
Comically to me, it has both the diamond and Apple's command key logo. Windows is the only one missing.
Sun keyboards had a diamond to mark that key, which is better to my mind than a third party commercial OS logo.
I wouldn't even mind if it was the keyboard manufacturer logo.
[0]: https://deskthority.net/wiki/File:Suntype7sf.jpg