A wiki link that uses restrictedTraversal to "dig" for pages deep inside other folders; only meaningful in multi-folder wikis (see WikiTree). For example:

... ZTUtils is really a spinoff from ZPT, so you can find more information in ZopePageTemplates/Releases...

(and _ZopePageTemplates/Releases_ becomes a link)

You can see it at work in http://zope.gf.com.br:8080/MetaWiki/