RH

RH, Rh, rH, or rh can stand for:

  • Riemann hypothesis, an important unsolved problem in mathematics
  • Ryan's Hope, a soap opera
  • Rhesus factor, a classification to describe blood types in humans
  • Rhodium, a chemical element
  • Republic Express Airlines IATA airline designator
  • Right-handed
  • Reinhard Heydrich, a chief of the Reich Security Main Office
  • Rh (digraph)
  • Red Hat, a GNU/Linux operating system
  • Robin Hood
  • The RH postal area in the United Kingdom Royal Mail postcode system
  • Rumbling Hearts, an anime
  • Rubeus Hagrid, a character in the Harry Potter series
  • Releasing hormone
  • Rush hour, the two parts of the day with busy traffic caused by commuting
  • Rush Hour (film series)
  • Reproductive Health
  • Respiratory Humidifier
  • Rydberg Constant, the Rydberg Constant for Hydrogen
  • The Right Honourable
  • Radiohead, an English alternative rock, electronica and experimental music band
  • Ron Howard, an actor
  • Robert Heinlein, an author
  • Relative Humidity, the amount of water vapor that exists in a gaseous mixture of air and water vapor