These are generic templates. For example, if there is no template to link to categories at MetaWiki, one can use this. One can also use Template:Sister to easily create more standard templates, like {{wikisource}} from above.
Markup
Displays
{{sister|project=commons|text=[[commons:Wikimedia Commons|]] has media related to: '''''[[Commons:{{{1|Special:Search/{{PAGENAME}}}}}|{{{2|{{{1|{{PAGENAME}}}}}}}}]]'''''}}
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