Which major language learning company rebranded in 2020 with a logo directly inspired by the International Phonetic Alphabet symbol for an open front unrounded vowel?

The International Phonetic Alphabet (IPA) is essential for linguists worldwide, representing every sound in human language with precision. But did you know that the IPA's visual identity has an interesting brand history? Test your knowledge about this crucial linguistic tool's brand evolution and how it's been incorporated into commercial language learning products over the decades.

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• Babbel, using the IPA symbol /æ/
• Duolingo, using the IPA symbol /ə/
• Lingoda, using the IPA symbol /a/
• Rosetta Stone, using the IPA symbol /ɑ/

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