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:

"https://si.wikipedia.org/w/index.php?title=සැකිල්ල:R_from_HTML_entity/sandbox&oldid=658034" වෙතින් සම්ප්‍රවේශනය කෙරිණි