Template:Redirect from sort name category/doc

Usage
This template is placed at the top of the subcategory pages of and. It requires as its first parameter, 1, or its second parameter, 2, the uppercase letter that comes at the end of the subcategory name. For the ambiguous-name categories, the third parameter, ambig may be used to slightly alter the text. As is common with unnamed parameters, those that are not used may be omitted or left empty.
 * Examples:

Parameter 3
The third parameter, ambig, will alter the text slightly to:
 * "The pages in this category are redirects from ambiguous sort names to their appropriate target articles. Use uppercase capital letters in these parameters. To add a redirect to this category, place {{ Rcat shell | {{ R from ambiguous sort name |1=..."