The unicorn tag could mean one of two things: the U-series codename for 14.10, or the prefork server that can be used in conjunction with other webservers.
It looks like there's edits in the tag wikis for Unicorn to be the latter of those two, but unicorn is marked now as a synonym of 14.10 as done by fossfreedom. But this may cause any number of confusing issues since the preexisting tag seems to have been the prefork server.
Is it a problem that we've got two things that're both on topic here, but the tag will be in conflict? Or have we got a resolution for this?