Which linguistic symbol is prominently featured in the logo of the International Phonetic Association (IPA)?

Brand identities in the language industry often reflect linguistic principles in their visual representation. From dictionaries to language learning apps, translation services to linguistic research institutions - their logos contain thoughtful design elements that communicate their mission. This poll tests your knowledge about how language-focused companies have incorporated linguistic symbols and concepts into their corporate identity.

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A stylized ear, representing the auditory nature of phonetics
The phonetic symbol 'ə' (schwa), representing the mid-central vowel sound
Overlapping speech bubbles, symbolizing language exchange
A sound wave pattern, illustrating acoustic phonetics