LGBT Info
This is a documentation subpage for Template:! (see that page for the template itself).
It contains usage information, categories and other content that is not part of the original template page.

Used to include a pipe character as part of a template argument. Before this was added as a magic word, many wikis implemented this by creating Template:! with | as the content.

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.

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.