SLAT is an acronym for 'suspended ceiling, LATH and tile, ' which is a type of construction used in ceilings. A LOUVER is a type of window or door with adjustable slats that can be opened and closed to control airflow. A SPLINE is a thin strip of material used to join two pieces of material together. LATH is a thin strip of wood or metal used as a backing for plaster or stucco. A LOUVRE is a type of window or door with adjustable slats that can be opened and closed to control airflow. A BATTEN is a thin strip of wood or metal used to cover a joint or seam. A piece of legislation is a law passed by a legislature.