This sound is known as the notification alert used by the Viber messaging app, a cross-platform chat and calling service launched in 2010. Short app alerts like this spread widely online because they instantly communicate that a message has arrived, even without showing the app interface. It remains useful in memes, skits, and edit culture for creators who want a familiar phone cue. Sounds in the same space include the Discord Notification, which serves a similar purpose for online chat jokes.