What does RH blood type mean?

Rh-positive is a type of blood type, that is, there is a D blood type substance on red blood cells in human blood, which can be called Rh positive. There is also a type of rh-negative blood, which is panda blood. There are very few people with this blood type. Positive is more common, and it is also possible to accept the yin and yang blood of this blood type without symptoms.