IXL is a subscription learning platform used in schools for maths, English and other subjects, and its practice questions give immediate audio feedback for right and wrong answers. The incorrect buzzer became familiar to a generation of students who heard it repeatedly in class and at home. As clips and soundboards spread on social media, the sound moved beyond homework and became a general error sound for memes, edits and classroom jokes. Its short length and instant recognisability keep it popular for marking a mistake.