Category:Hidden categories

In cases where, for technical reasons, project categories appear directly on articles rather than talk pages, they should be made into hidden categories, so that they are not displayed to users. The categories that should appear here are the maintenance categories, that is, categories reflecting the present status of the page, rather than classifying the article subject.

To hide a category, uses the magic word. This also places the page in this cateogy.

A logged-in user may elect to view all hidden categories, by checking "Show Hidden Categories" on the "Misc" tab of My Preferences. Notice that "hidden" parent categories are never in fact hidden on category pages (although they are listed separately).