The classic blood type is the ABO type and either Rh- or Rh+. Rh stands for the Rhesus antigen. If a person has the Rhesus antigen it means they are Rh+, and if they don't it is Rh-.

The most common Rhesus antigen is the Rhesus (D) antigen. However, it is important to know that there are many because