Which global language learning platform rebranded in 2019 by adding a linguistic element to its logo that represents the 'trill' sound found in many languages?

Linguistic elements play a crucial role in how brands position themselves and connect with consumers. Brand names, slogans, and terminology can shape perception and create lasting impressions. This trivia question explores how language innovation has been strategically used in a specific brand's evolution to maintain relevance while honoring linguistic heritage.

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Duolingo (with the addition of a vibrating soundwave symbol)
Babbel (with the addition of a rolled 'r' symbol)
Rosetta Stone (with the addition of phonetic pronunciation guides)
Memrise (with the addition of IPA transcription elements)