This redirect category (Rcat) template populates Category:Redirects from plurals. Add this Rcat to a redirect in the following manner:

#REDIRECT [[(Target page name)]]{{R from plural}}

Use this Rcat on all redirects from the plural of a singular target. The Rcat {{R to singular}} redirects here and can also be used.

There is usually no need to show plural forms in print, so this Rcat populates Category:Unprintworthy redirects by default.

Some plurals are printworthy, for example the Arabic and Latin forms. When you add this Rcat to a redirect that you decide is printworthy, then use the first parameter to subdue the unprintworthy category in the following manner:

{{R from plural|printworthy}}

That will subdue "unprintworthy" and, in addition, add the redirect to Category:Printworthy redirects.