The term HOSP. AREA refers to the various areas of a hospital. EMER is an abbreviation for Emergency Room, which is where patients with urgent medical needs are treated. CCU stands for Coronary Care Unit, which is a specialized unit for treating heart conditions. ICU stands for Intensive Care Unit, which is a unit for providing intensive care to critically ill patients. PREOP is an abbreviation for Preoperative, which is the area of the hospital where patients are prepared for surgery.