A mannequin (also called a dummy, lay figure or dress form) is an often articulated doll used by artists, tailors, dressmakers, and others especially to display or fit clothing. The term is also used for life-sized dolls with simulated airways used in the teaching of first aid, CPR, and advanced airway management skills such as tracheal intubation and for human figures used in computer simulation to model the behaviour of the human body. During the 1950s, mannequins were used in nuclear tests to help illustrate the effects of nuclear weapons on human beings.