Template:DEFAULTSORT
From Bahaipedia
 | Please use {{DEFAULTSORT:Sortkey}} rather than {{DEFAULTSORT|Sortkey}}, with a colon (":"), not a pipe symbol ("|"). This uses the magic word directly instead of using the template to call the magic word. |
{{DEFAULTSORT:<sort key>}} is a magic word used to apply a sort key to many categories at once. It can be overridden for individual categories applied to an article by manually applying a sort key.
See also:
