Discord is a chat and voice platform widely used by gaming and online communities, and its short notification tone has become shorthand for a new direct message arriving. The da dan sound is the app's familiar alert, heard whenever a message or mention pops up while the app is running in the background. As Discord grew into everyday group chats, streamers and meme editors began dropping the clip into videos to imitate that moment, and it stuck because almost everyone recognises the ping instantly, even outside the app itself.