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That is the "command" symbol, from classic Mac OS, denoting a command-key menu equivalent. Various Apple keyboards had it printed on the relevant key.

Exactly, you catch it.

It was used to replace the apple logo when Jobs saw it sprinkled all over the menus. "Dont use our logo in vain" or something

Oh, Maybe. Thanks for your information.

Please use Ask HN at the beginning of posts like this.

Thank you.

Alright, thanks.

I know it is a Nordic road sign

Nope, but that's OK.

I think you are mistaken:

https://sv.wikipedia.org/wiki/Sev%C3%A4rdhet

Oh, I am so sorry. You are right. I didn't know It has this meaning, too.

What do you know about "⌘"?