In ice hockey, a loud arena siren, often called a period buzzer, has long been used to mark the end of a period, cutting through crowd noise so players, officials and fans know play has stopped. The same sharp sound is familiar from televised games and rink broadcasts, where it signals a break, a result or a turning point. Online, creators have adopted it as a shorthand for finality, dropping the short blast at the end of edits, sports clips and reaction videos to make a moment feel decisive.