An abat-son (plural usually abat-sons) is an architectural device constructed to reflect or direct sound in a particular direction. It consists of large louvers. The term is commonly used to refer to angled louvers in a bell tower or belfry designed to redirect sound or to prevent ingress of water. Abat-son can also refer to a louver or board used in the device. These boards or sheets are typically made of wood or metal. The term comes from the French term of the same name, which literally means "to strike down" (abat) the "sound" (son) or "sounds" (sons).