Which global coffee chain named their customer loyalty program after a mythological figure that was known for being a guide to the underworld?

In the world of retail and brand strategy, mythology and folklore have been powerful inspirations for product naming, brand storytelling, and customer loyalty programs. Many successful brands have leveraged ancient legends and cultural tales to create memorable customer experiences and brand identities. This trivia question tests your knowledge of how one famous brand utilized mythology in their customer loyalty strategy.

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Starbucks' 'Siren Rewards' (named after the dangerous mythological creatures that lured sailors)
Dunkin's 'Phoenix Perks' (named after the bird that rises from its ashes)
Costa Coffee's 'Hermes Club' (named after the messenger god and guide to the underworld)
Peet's Coffee's 'Thor's Thunder' (named after the Norse god of thunder)