RH

RH, Rh, rH, or rh may refer to:

Companies

• Red Hat, an American software company
• Republic Express Airlines (IATA designator), a cargo airline in Indonesia
• RH (company), an American furniture chain formerly known as Restoration Hardware

Science and technology

• Relative humidity, the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature
• Releasing hormone
• Rh blood group system (Rhesus factor), a classification to describe blood types in humans
• Rhodium, symbol Rh, a chemical element
• R_H, the Rydberg constant for hydrogen
• Riemann hypothesis, an important unsolved problem in mathematics

Places

• RH postcode area, in the UK
• Republika Hrvatska, an official name of Croatia in Croatian

Other uses

• Rh (digraph)
• The Right Honourable, an honorific preceding a name in the UK
• Radical honesty, the practice of always being completely honest and refraining from telling even white lies

See also

• Royal Hospital (disambiguation)