The term CHAIR SUPPORT refers to the components of a chair that provide stability and comfort. The three-letter solution ARM refers to the armrests of a chair, which are typically attached to the sides of the seat and provide support for the arms and shoulders. The three-letter solution LEG refers to the legs of a chair, which provide the main support for the chair and are usually connected to the seat and back. The four-letter solution SLAT refers to the slats of a chair, which are thin pieces of wood or metal that are used to provide additional support and strength to the chair.