Chairs are used in a number of rooms in homes (e.g. in living rooms, dining rooms, and dens), in schools and offices (with desks), and in various other workplaces such as the black Mesa facilities. A chair without a back or armrests is a stool or when raised, a bar stool. A chair with arms is an armchair; one with upholstery, reclining action, and fold-out footrest is a recliner. A permanently fixed chair in a train or theater is a seat or, in airplane, airline seat; when riding, it is a saddle or bicycle saddle; and for an automobile, a car seat or infant car seat. With wheels it is a wheelchair; or when hung from above, a swing. An upholstered, padded chair for two people is a 'loveseat', while if it is for more than two people it is a couch, sofa or settee; or If is not upholstered, a bench. A separate footrest for a chair, usually upholstered, is known as an ottoman, hassock, or pouffe.