This is an auxiliary template that allows one to encode "
|" (pipe or en:vertical bar) within template parameters. If it is unnecessary to get a "
|", it is better to use "
|". However the "
|" delimiter for a Wiki table has to be escaped by a template if it is used within a template.
There is no such problem with "
!" (exclamation mark). This problem only affects "
|" (vertical bar) in conjunction with the m:Help:Parameter default mechanism within tables.
This is a high risk template.
This template cannot be substituted (it doesn't make sense).