To include a template in this category, add [[Category:Wikipedia metatemplates]]
to the <includeonly> section at the bottom of the template's /doc subpage if such a page exists. Otherwise, add <noinclude>[[Category:Wikipedia metatemplates]]</noinclude>
to the end of the template code, making sure it starts on the same line as the last character of the code.
This category contains meta-templates. That is templates that are used as building blocks inside other templates.