Which language learning platform deliberately removed the dot over the letter 'i' in its logo to represent the removal of language barriers?

The world's most valuable language technology companies invest millions in their brand identities. Sometimes, the tiniest linguistic details in logos and brand names carry significant meaning. This trivia question explores how one major language learning platform used a clever linguistic feature in its logo to reinforce its brand message and appeal to language enthusiasts worldwide.

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Duolingo
Babbel
Rosetta Stone
Memrise