Which revolutionary product design feature, first implemented by Merriam-Webster in their print dictionaries in 1909, dramatically improved user navigation and was later adopted by virtually all dictionary publishers?

The design of dictionaries has evolved dramatically in the digital age, transforming how we interact with language resources. From traditional bound volumes to sophisticated e-commerce platforms and apps, dictionary products have undergone significant redesign to improve user experience, accessibility, and functionality. This poll tests your knowledge about a major innovation in dictionary product design that revolutionized how users navigate and access linguistic information.

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Thumb indexes (indentations on page edges showing alphabetical sections)
Color-coded word etymologies
Pronunciation symbols in the International Phonetic Alphabet
Hierarchical numbering system for multiple word definitions