Which language learning app's logo was specifically designed to represent the concept of 'breaking through the barrier of language learning'?

Logos and branding in the language industry often contain fascinating linguistic elements. This poll tests your knowledge about how language, symbols, and meaning intersect in famous language-related company logos. The thoughtful design of these logos often reflects the linguistic principles these companies promote or study.

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Duolingo (with its owl mascot)
Babbel (with its speech bubble design)
Rosetta Stone (with its black stone tablet icon)
Memrise (with its flower bursting through a geometric pattern)