Parser functions 
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| Image shows: | Powerful |
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| Description: | There are built-in functions; and there are additional functions enabled by the mw:Extension:ParserFunctions |
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| Notes: | As of v1.18, the ParserFunctions extension is bundled with a download of mw. You do need to enable it. |
Generally speaking, if you're going to use any parser functions, you will need to create/use the {{!}} template for hiding a pipe character from the parser.