Which famous retailer created a customer loyalty program named after the Norse mythological tree 'Yggdrasil' that connects the nine worlds?

Throughout history, mythology and folklore have influenced retail strategies in surprising ways. From store layouts mimicking hero's journey narratives to product names invoking legendary powers, retailers have long tapped into our collective mythological consciousness. This poll explores how one famous retail giant incorporated folklore elements into their customer retention strategy, creating a modern retail legend of their own.

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IKEA, with their 'Världsträd' (World Tree) loyalty program that offered different rewards at nine membership levels
Barnes & Noble, with their 'Bifröst Bridge' program connecting readers to nine literary genres
Whole Foods Market, with their 'Nine Realms' program offering rewards for sustainable shopping choices
Anthropologie, with their 'Mythic Roots' program featuring nine tiers of exclusive merchandise access