Which language learning platform's name comes from the Spanish phrase for 'two tongues' and was deliberately chosen to represent the bilingual mission of the company?

In the world of language and linguistics, brand names often play with etymology, morphology, and phonetics to create memorable impressions. Some of the most successful language-based brands have revolutionized how we think about communication tools and language learning. Test your knowledge about a linguistic company that made a particularly clever branding decision that reflected their product's purpose.

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Duolingo
Babbel
Rosetta Stone
Memrise