RH

RH, Rh, or rh can stand for:

*The Riemann hypothesis, an important unsolved problem for mathematics
*Ryan's Hope, a soap opera
*Rhesus factor, a classification to describe blood types in humans, and a related Rh disease of newborns
*Rhodium, a chemical element
*Relative humidity
*Republic Express Airlines, IATA airline designator
*Right-handed
*Reinhard Heydrich, chief of the Reich Security Main Office
*Rh (digraph)
*Red Hat GNU/Linux operating system
*Robin Hood
*The RH postal area in the United Kingdom Royal Mail postcode system
*Rumbling Hearts, an anime