Rh positive is a medical term used to describe blood that contains a specific antigen on the surface of red blood cells. In the context of blood transfusions and pregnancy, it is important to match the Rh factor of the donor or mother with the recipient or baby's blood type. However, there are several synonyms for Rh positive, including Rh+, Rh factor present, D antigen present, and Rhesus positive. These terms are commonly used interchangeably among healthcare professionals to describe the same characteristic of blood. It is important for individuals to know their blood type and Rh factor, as it can affect their health and medical treatment.