The cash register sound has been a shorthand for money for decades, first heard in shops and later in cartoons, sitcoms, and commercials where a sale needed to be understood in an instant. As a stock sound effect, it travelled easily into online video, where creators use it as audio punctuation for earnings, shopping hauls, and jokes about getting paid. Its staying power comes from that instant recognition: listeners do not need context to know that money has just been made.