Duolingo is a language learning app known for short, gamified lessons, and its correct answer chime is one of its most recognisable interface sounds. The effect was designed to give immediate positive feedback, reinforcing progress during exercises in vocabulary, listening and speaking. As lessons and memes about streaks and notifications spread on social media, the sound moved beyond the app itself. Creators now reuse it as shorthand for being right, passing a test or completing a task, even in videos that have nothing to do with learning a language.