The term 'stretcher' can refer to three different items. The first is a 'LITTER', which is a type of portable bed or couch used for carrying injured or sick people. The second is a 'RACK', which is a frame or stand used to support something, such as a stretcher. The third is a 'GURNEY', which is a wheeled bed used in hospitals and ambulances to transport patients. All three items are used to transport people who are unable to walk on their own.