Sonnerie lycée refers simply to the bell or ringing system used in French secondary schools, where pupils move between classrooms throughout the day. Clips of the sound circulate on soundboards and in short videos because the tone is recognisable even without any image of a school. Creators reuse it as a shorthand for lessons, exams, detention and rushed corridor changes, often pairing it with footage of students packing bags or running late. Its popularity comes from that shared school experience rather than from a film or song.