Template:!!
From D&D Wiki
||
This is an auxiliary template that allows one to encode "||" (two pipes or vertical bars) 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.
Notes
There is no such problem with "!!" (exclamation marks). This problem only affects "||" (vertical bars) in conjunction with the Parameter default mechanism within tables.
