This is an auxiliary template allowing to encode "|" within template parameters. It is necessary if the character is used in wiki table syntax. In other cases it is better to use "|".

This template cannot be used for putting the character as text in a wiki table; in that case, again, "|" can be used.

Note that no special template is needed for "!" (exclamation mark).

This is a high risk template, and it cannot be substituted.