Help:Special pages
From Gentoo Wiki
Special pages are pages that are created on demand and are located in their own namespace : "Special:". Special pages are not editable directly, like other pages.
Some special pages depend on the preferences that have been set by a user, e.g. the number of titles which is displayed on a user's watchlist. Some special pages can be transcluded.
See Special:Specialpages for a list of all special pages on a wiki.