These are the ssh escape commands from within an ssh connected session.
Supported escape sequences:
~. – terminate connection (and any multiplexed sessions)
~B – send a BREAK to the remote system
~C – open a command line
~R – Request rekey (SSH protocol 2 only)
~^Z – suspend ssh
~# – list forwarded connections
~& – background ssh (when waiting for connections to terminate)
~? – this message
~~ – send the escape character by typing it twice
(Note that escapes are only recognized immediately after newline.)
The ~ (tilda) is normally accessed by keying [shift] + [`]
To pull up the list as above send a Tilda + Question Mark ~?