Which famous literary-related logo contains a hidden element that is commonly misunderstood by the public?

Behind many famous logos lie fascinating connections to literature and the arts. Publishers, bookstores, and literary brands often embed clever references in their visual identities. This trivia tests your knowledge of these artistic logo designs that have become iconic in the literary world. Can you identify which famous literary brand's logo contains an element that most people misinterpret?

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The Penguin Books logo actually features a macaroni penguin, not an emperor penguin as widely believed
Amazon's logo arrow points from A to Z, representing their complete catalog, not a smile as commonly thought
The Starbucks siren logo was inspired by a 16th-century Norse literary work, not Greek mythology as often assumed
Barnes & Noble's logo quill pen contains a hidden letter 'r' that most customers never notice