Alarm sirens like this one come from civil defence and emergency warning systems, where a rising wail is used to alert people to danger and prompt them to take cover. Short clips of the sound spread widely on soundboards, video editors and meme pages, where creators reuse it as a shorthand for disaster, panic or an overblown reaction. It remains popular because the tone is instantly recognisable, even without context, and works in the same way as a social credit siren for signalling that something has gone badly wrong.