This sound is used online as a practical writing effect: a pencil making a checkmark on paper. Unlike a synthetic notification tone, it gives edits a more real-world, handwritten feel, which is why creators use it in checklist videos, study content, grading jokes, and organization clips. Its staying power comes from how clearly it matches a visual action in under a second. It also pairs naturally with simple UI-style sounds such as a ding sound effect when editors want both a physical mark and a small success cue.