Which dictionary publisher pioneered the use of a unique 'thumb index' feature on their physical dictionaries that displays color-coded language sections for quick reference?

Product packaging often features text in multiple languages to reach diverse markets. However, the way language is presented on packaging can reveal fascinating insights about brand strategy, target demographics, and cultural considerations. This trivia question explores how major dictionary publishers have innovated their physical product packaging to enhance the user experience for language learners and linguists.

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Oxford University Press
Merriam-Webster
Collins
Cambridge University Press