The sound comes from the passenger information system used across Moscow public transport, where a short chime warns riders that an announcement about stops or service changes is about to play. Russian-speaking users began sharing the clip online as a standalone notification sound, and it spread through travel videos and meme edits. Its formal transit tone is often compared to other notification sounds such as the Discord notification or a basic ding sound effect, but its specific melody remains tied to Moscow buses, trams and metro services in listeners' minds.