👉 Plank, a small rectangular board made of wood or metal that is used to support and hold objects in place. In woodworking, planks are commonly used as supports for tools such as saws, drills, and screwdrivers, as well as for mounting shelves and other furniture. plank, a small rectangular board made of wood or metal that is used to support and hold objects in place. (plank, a small rectangular board made of wood or metal that is used to support and hold objects