Which linguistic product innovation was marketed with the slogan 'You could look it up' and revolutionized dictionary access in the 1960s with thumb indexes?

In the world of language and linguistics, product naming and branding can make or break a product's success. One particular linguistic innovation revolutionized how dictionaries were marketed and consumed, turning a reference book into a household name through clever brand storytelling and product development. Test your knowledge about this groundbreaking linguistic product that changed how we interact with language tools!

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The Oxford English Dictionary Concise Edition
Webster's New World Dictionary
The Random House Dictionary
The Merriam-Webster Dictionary with A-Z thumb indexing