The term 'Motion-Picture Spool' refers to a REEL, which is a cylindrical device used to store film. It is typically made of metal or plastic and has a central hub with radial spokes that hold the film in place. The spool is used to wind and unwind the film, allowing it to be viewed or edited. Motion-picture spools are an essential part of the filmmaking process, as they allow for the storage and manipulation of film.