Template:!
Outputs a literal pipe character (|) as plain text. Used inside other templates or documentation examples where a raw pipe would otherwise be interpreted as a parameter separator — for instance, inside a table, a wikilink with piped text nested inside another template call, or a documentation example showing raw template syntax (the same pattern used in the real MediaWiki {{Ll}} documentation you pasted earlier, e.g. {{((}}ll{{!}}Project:About{{))}}).
Usage:
{{((}}CategoryInfobox{{!}}name=Kent{{))}}
Renders as: {{CategoryInfobox|name=Kent}} — displayed as plain text, not a working transclusion.
Parameters
None — this template takes no input, it just outputs |.
