#!/bin/sh is a command in the beginning of a shell script, sometimes called a header. The shell executing the script checks whatever is behind the #! and executes what follows that line with whatever is on that line. For example, if I want my script to be run in the Korn shell i would put #!/bin/ksh in the beginning of my script.
Also a vanity IRC channel, something that just looks cool when someone does a /whois on you.

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