In Portuguese, toque da escola literally means the school bell, the signal used in schools in Brazil and Portugal to mark lesson changes, breaks and the end of the day. The sound itself is a generic electric bell rather than a clip from a film or television show, which is why it feels familiar to so many listeners. Online it circulates as a short classroom effect for memes, school parodies and study videos, where its instantly recognisable ring sets the scene faster than any caption.