In the Vinony graph
It sits within the topics Templates using TemplateData and Templates with no visible output.
Vinony links it to 50 Wikipedia language editions.
~1 min read
Encyclopedic overview
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This template is designed to exclude categories that legitimately contain pages in both the (Main) namespace and the user namespace from Wikipedia:Database reports/Polluted categories.
Excerpted from Wikipedia’s “Template:Polluted category” article, available under the CC BY-SA 4.0 licence.