Known in German as the Pausengong or Schulgong, this four-tone signal has long been used in schools to mark lesson changes, breaks, and the start and end of the school day using an automatic public address system. The gentle chime sequence replaced louder bells in many buildings because it carries clearly without sounding like an alarm. The recording later spread online as a downloadable ringtone, listed as a four-sound school gong for phones, and became popular on soundboards for classroom pranks and reaction videos recreating the moment lessons finish.