This sound comes from Duolingo, the language-learning app known for its gamified lessons, streaks, and reward cues. The completion chime became recognizable through everyday app use, then spread into short-form edits and memes about studying, discipline, and finally finishing something. Creators use it because the sound is instantly associated with progress and a small digital reward. In meme culture, it often appears in ironic clips about keeping a streak alive or treating basic tasks like they are game achievements.