"Rh positive" refers to the presence of the Rhesus factor, a specific protein found on the surface of red blood cells. If a person has this protein, they are classified as Rh positive, while those without it are Rh negative. This classification is important in blood transfusions and pregnancy, as mismatched Rh types can lead to complications. In the context of blood types, Rh positive individuals can have various combinations, such as A Rh positive, B Rh positive, AB Rh positive, or O Rh positive. Understanding one's Rh status is crucial for medical procedures and ensuring safe blood compatibility.