Vorlage:!

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This template is used in conjunction with optional parameters: see the talk page for details. This template is related to some extremely complicated and esoteric features of template syntax. Please do not attempt to alter it unless you are certain that you understand the setup and are prepared to repair any consequent collateral damage if the results are unexpected. Any experiments should be conducted in the template sandbox or your user space.

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This is an auxiliary template allowing to encode "|" within template parameters. It is unnecessary to get a "|" in these cases, better use "|" for this purpose. However the "|" delimiter for a Wiki table has to be escaped by a template if it's used within a template, see also WP:QIF.

Note that there's no such problem with "!" (exclamation mark), it only affects "|" (vertical bar) in conjunction with the m:Help:Parameter_default mechanism within tables.

For obvious reasons this is a high risk template, and it cannot be substituted.