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A list of all categories can be found at Special:Categories – there are many listed but you can use the search box. Category:Wikipedia categories is the standard top-level category provided by the MediaWiki software, but orphan categories (categories without any parent categories) can exist.
This category has the following 27 subcategories, out of 27 total. A. Lists of awards lists (30 P) B. ... Lists of most expensive items by category; N.
This category has the following 6 subcategories, out of 6 total. F. Lists of brand name foods (27 P) L. Lists of brands (4 C, 55 P) M. ... Category: Lists of products.
Every category should be a subcategory of another category. The top of the articles category hierarchy can be accessed at Category:Main topic classifications. If a suitable parent category likely exists but cannot be found, adding the {{Uncategorized}} tag is advisable. The category will then appear at Special:Uncategorizedcategories.
1. to enable a person to find a book of which any of the following is known (Identifying objective): the author; the title; the subject; the date of publication; 2. to show what the library has (Collocating objective) by a given author; on a given subject; in a given kind of literature; 3. to assist in the choice of a book (Evaluating objective)
The earliest library classification schemes organized books in broad subject categories. The earliest known library classification scheme is the Pinakes by Callimachus, a scholar at the Library of Alexandria during the third century BC. During the Renaissance and Reformation era, "Libraries were organized according to the whims or knowledge of ...
The {{All included}} can be used for categories where all child articles of a certain type are in the parent, like Category:Presidents of the United States or Category:Mountains of Switzerland. Subcategories defined by gender, ethnicity, religion, and sexuality should almost always be non-diffusing subcategories to prevent othering.
Categories (along with other features like cross-references, lists, and infoboxes) help you to find information, even if you don't know what exists or what it's called. The following list of categories of Wikipedia's coverage parallels our other lists by topic.