From AffiliateBang Wiki

page_name is a Midge which shows the name of a specified page id.

Example

<a href="[#page_link,testpage]">[#page_name,testpage]</a>

Returns

Will create a link that always points to testpage and shows the title specified on Edit Pages. Even after updating/changing the page name or changing the URL layout of your particluar site, the URL will still be accurate. This is useful for creating multiple pages content on your site.