Category:Reviewed images replacing placeholders

This is a "tracking category", a category intended to build and maintain a list of pages primarily for the sake of the list itself. Rather than being part of the encyclopedia's categorization scheme, these categories are used to track, for example, the use of syntaxes that may be deprecated in the future, to maintain a list of pages that may need to be edited en masse later, or to aggregate the members of several sub-categories by other classifications into one larger list.

Some maintenance lists need to be checked periodically for backlogs, such as Categories for discussion notices and other XfD administrative tracking categories.