M key means Meta key. It is normally the Alt key.

On 07/20/09, John Wong wrote:
> Sorry, the question maybe ......
> I'm tmux/openbsd user, i read the man page, and see some key is like "M-Up
> resize-pane -U 5".
> But what exactly should i type?
> 
> I know C-b mean is "Ctrl + b", but M-o ...
> what is "M-" key?
> Please help, thank you.

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