Template:Template category

This category contains pages in the template namespace.

It should not be used to categorize articles or pages in other namespaces.

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To add a template to this category, add <noinclude>[[Template:Template category|{{PAGENAME}}]]</noinclude> to the end of the template. Make sure that the opening <noinclude> starts on the same line as the last character of the template code.

See Wikipedia on this and expand here.