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This templates produces the {| sequence (i.e., start of wikitable), so that wikitables can be built inside templates.
Explanation
The problem is that if a pipe character "|" appears in a template, the template parser assumes that the pipe is part of the template; and so if there is a table within a template the pipe symbols that are usually interpreted as part of the table syntax will be interpreted first as part template.
To prevent this happening it is possible to "hide" the pipe character of the table from the template parser by substituting {{!}} for a pipe character.
See mw:Help:Magic words#Other and mw:Help:Template#A parameter value containing a pipe character
TemplateData
This is the TemplateData for this template used by TemplateWizard, VisualEditor and other tools. See a monthly parameter usage report for Template:(! in articles based on its TemplateData.
TemplateData for (!
This template produces {| as ordinary text.
| Parameter | Description | Type | Status | |||
|---|---|---|---|---|---|---|
| No parameters specified | ||||||