ParserFunctions - Mediawiki
From Help Wiki
The MediaWiki extension ParserFunctions is a collection of parser functions (note the difference between the name of the collection, and the general term). These parser functions have a hash character in front of the function name, so they typically have the syntax:
{{ #functionname: argument 1 | argument 2 | argument 3...}}
See http://meta.wikimedia.org/wiki/WM:PF for a complete description of functionality and syntax.
{{ '''#time''': <tt>"The month is" F</tt> }} → The month is September