When used with the "Redirect category shell" (Rcat shell) template:

Template {{Redirect category shell}} may be used to add one or more rcat templates, along with their parameters and categories, to a redirect. For more information, see the documentation page below.

When used by itself:

  • From an abbreviation: This is a redirect from an abbreviation to a related topic, such as the expansion of the abbreviation. Use this template for any length reduction other than the following.
    • Instead of this template:
      • use {{R from acronym}} for abbreviations that are pronounced as words, such as NATO and RADAR;
      • use {{R from initialism}} for those abbreviations that are pronounced as letters, such as CIA and HIV;
      • use {{R from short name}} for the initials of a person's name or for any other length reduction that is not typically classed as an abbreviation.