Wikipedia:Integration
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int is a special function prefix that is inserted in a template when trying to template a system message. It is used to replace $foo with {{{foo}}}.
$foo is used for variables. Normally, for a template, {{{foo}}} is used as a variable, however, in the MediaWiki namespace this is not the case.
Compare the difference:
{{MediaWiki:Youhavenewmessages|variable1|variable2}} makes
MediaWiki:Youhavenewmessages
However, replace 'MediaWiki' with 'INT' making {{int:Youhavenewmessages|variable1|variable2}} makes
⧼Youhavenewmessages⧽