Hospital ward is a term used to describe the different areas of a hospital where patients are treated. The four letter UNIT is typically a general area of the hospital, such as a medical or surgical ward. ICU stands for Intensive Care UNIT, which is a specialized area of the hospital that provides intensive care for critically ill patients. Finally, Sickbay is a term used to describe a medical facility on a ship or other vessel, where crew members can receive medical attention.