Overwatch is Blizzard Entertainment's team-based hero shooter, first released in 2016, and its in-game interface uses short, polished sounds to flag party and group activity. The invite tone became familiar to millions of players who spent time queuing, grouping with friends and waiting in lobbies, so it carried naturally into clips, streams and memes about playing together. It remains useful because the sound is short, clear and instantly tied to joining a team, even for viewers who no longer play regularly.