Thread:Project:Support desk/external link image usage?/reply

As far as I can tell, the icon dates back to special:code/MediaWiki/2881. Presumably gabriel wicke made it himself.

As for re-using it, technically it (should be) licensed under the GPLv2 like the rest of MediaWiki code. Saying something like "This icon comes from the MediaWiki software package, and is used under the GPL" is probably more than sufficient. Honestly, I doubt anyone is really going to care that much about the small little icon.