Which linguistic product innovation, introduced in 1963, revolutionized dictionary retail by adding a feature that made lookups significantly faster and more intuitive?

Language plays a crucial role in retail marketing and branding. From multilingual packaging to culturally-sensitive advertising, linguistic choices can make or break a product's success in global markets. This poll tests your knowledge about a fascinating linguistic innovation that changed how dictionary publishers approached their retail strategy and product design. Are you familiar with the marketing history behind one of the most significant innovations in reference book publishing?

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Thumb indexes (indentations on page edges showing letter positions)
Phonetic pronunciation guides using International Phonetic Alphabet
Color-coded part-of-speech indicators
Etymological timelines showing word origins