Extension:Approved Revs - MediaWiki
www.mediawiki.org/wiki/Extension:Approved_Revs
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Approved Revs is an extension that lets administrators mark a certain revision of a page as "approved". The approved revision is the one displayed when users view the page at its main URL.