Transclusion is generally the inclusion of the content of a document into another document by reference.
See https://www.mediawiki.org/wiki/Transclusion
Partial transclusion tags
More about <noinclude>, <onlyinclude> and <includeonly>: see https://www.mediawiki.org/wiki/Transclusion#Partial_transclusion
Specialpages
{{Special:RecentChanges|namespace=10|limit=5}}, produce:14 May 2024
It does not work with FR/DE/... wikis (gives a 301 nginx error).
In game
To include wiki pages in game, see Templates under Category:IGtemplate: all between {{IGend}} and {{IGstart}} will be displayed in game.