When I run revert-buffer in emacs it says:

You can run the command `revert-buffer' with s-u

I've never seen any keybinding beginning with s- before. What key is that?

My emacs version is GNU Emacs 23.2.1 (x86_64-apple-darwin, NS apple-appkit-1038.29) of 2010-05-08 on black.local

Update: Now I see why I didn't understand s-u. It is something added by aquaemacs. The first thing I did after installing aquaemacs was (setq mac-command-modifier 'meta) to make it work the way I expect.

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up vote 4 down vote accepted

It's the Super Key, similar to Meta. More information in this StackOverflow answer.

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By default, Emac's super key is bound to apple's Command key on for emacs built with the NS or NextStep option. At least that was the case on my copy. – Shannon Severance Oct 30 '10 at 0:10
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