BiLinks is a proposed WikiPragma, written as a pseudo-icon '<->', intended to be placed on the bottom of the page,
explained at http://www.aboutus.org/BiLinks:
It is a natural generalization of the TwinPages pragma, where the author proposes the pseudo-icon '<=>'
More in MeatballWiki, to which this page is 'Bilinked':
Bilinked pages are also called PartnerPages.
It is different from a Sister page, which if existing should display the Meatball logo at the bottom of this page, which as of today (20120924) it does not.