Usage

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{{#invoke:TEMPLATENAME|main}}

This module returns the name of the page it is being transcluded from. This differs from {{FULLPAGENAME}} which returns the name of the currently viewed page even if it is called from a template. To use this doc page as an example, {{#invoke:TEMPLATENAME|main}} -> Module:TEMPLATENAME/doc while {{FULLPAGENAME}} -> Module:TEMPLATENAME/doc.