Help:Link/sub/page/name1/sub/page/name2/subpage level 3

Notice, in the upper left of the page, the breadcrumb navigation links leading to the root page.

{{Subpage help}}

Equalities?	Variables and markup	Live rendering
On subpages, these three:	fullpagename	Help:Link/sub/page/name1/sub/page/name2/subpage level 3
namespace:basepagename/subpagename	Help:Link/sub/page/name1/sub/page/name2/subpage level 3
../subpagename	Help:Link/sub/page/name1/sub/page/name2/subpage level 3
On subpages, these two:	pagename	Link/sub/page/name1/sub/page/name2/subpage level 3
	basepagename/subpagename	Link/sub/page/name1/sub/page/name2/subpage level 3
On root and 1st sub/page:	basepagename	Link/sub/page/name1/sub/page/name2
	rootpagename	Link
On subpages, these equal nav links.	[[../]]	Help:Link/sub/page/name1/sub/page/name2
	[[../../]]	Help:Link/sub/page/name1/sub/page
	[[../../../]]	Help:Link/sub/page/name1/sub
List subpages of this page

[[../../]] and [[../../../]] are redlinks because of the two slash / characters. But on [[../]], you will find [[../]] and [[../../]] are redlinks.