This is an administrative category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories (except for eponymous maintenance categories).

This is a container category. Due to its scope, it should only contain subcategories.

This is a tracking category. It builds and maintains a list of pages primarily for the sake of the list itself. They are not part of the encyclopedia's categorization scheme.

• This category is hidden on its member pages—unless the corresponding user preference (Appearance → Show hidden categories) is set.
• These categories can be used to track, build and organize lists of pages needing "attention en masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience.
• These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list (discriminated by classifications).

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• CAT:WRONGCAT:WRONG

Administrators: Please do not delete this category as empty!

This category may be empty occasionally or even most of the time.

If this category has 30 items or more, it will be reported as a backlog. (recount)

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There are templates that should only be used in one namespace or a limited number of namespaces. If those templates are used in other namespaces, then they will likely populate this category. Many templates use the "demo" or "nocat" parameters to allow usage in other namespaces.

Some templates may only be used in one or two namespaces, while others may be used in any namespace. Still others can be used in all but one namespace. An rcat's template documentation is required to show if there are any namespace limitations.

If any template is used in the wrong namespace, then instead of populating the appropriate category, it may populate this category. Be sure to have your User Preferences – Advanced options set to "Show hidden categories". Most templates place the pages that use them into hidden categories, like this one, and you will not be able to see the hidden categories on redirect pages until you set your preferences to "show" them.