Help:Categories/Sort Key
A sort key specifies where the page will appear in the category list, and under which letter heading. (By default, the page is sorted under the first letter of its full name including its namespace.) You can add a sort key to a page by adding it inside the Category tag. For example, the tag below will add the page under the heading "S".
[[Category:NAME|SORT]]
Sort keys are case-sensitive, and a space is also valid. The order of the sections within a category follows the Unicode sort order (see below). The sort key does not change the page title displayed in the category.
!"#$%&'()*+,-./0123456789:;<=>? @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_ 'abcdefghijklmnopqrstuvwxyz{|}~?