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

Companies

Red Hat Red Hat, Inc. is an American software company that provides open source software products to enterprises. Founded in 1993, Red Hat has its corporate headquarters in Raleigh, North Carolina, with other offices worldwide. Red Hat has become ass ...

, an American software company *

Republic Express Airlines Republic Express Airlines (RPX Airlines) is a cargo airline based in Jakarta, Indonesia. It operates domestic and regional cargo services.Flight International 12–18 April 2005 Republic Express Airlines is listed in category 2 by Indonesian Civil ...

(IATA designator), a cargo airline in Indonesia *

RH (company) RH (formerly Restoration Hardware) is an upscale American home-furnishings company headquartered in Corte Madera, California. The company sells its merchandise through its retail stores, catalog, and online. As of August 2018, the company operate ...

, an American furniture chain formerly known as Restoration Hardware

Science and technology

Relative humidity Humidity is the concentration of water vapor present in the air. Water vapor, the gaseous state of water, is generally invisible to the human eye. Humidity indicates the likelihood for precipitation, dew, or fog to be present. Humidity depe ...

, the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature *

Releasing hormone Releasing hormones and inhibiting hormones are hormones whose main purpose is to control the release of other hormones, either by stimulating or inhibiting their release. They are also called liberins () and statins () (respectively), or releasing ...

Rh blood group system The Rh blood group system is a human blood group system. It contains proteins on the surface of red blood cells. After the ABO blood group system, it is the most likely to be involved in transfusion reactions. The Rh blood group system consists ...

(''Rhesus factor''), a classification to describe blood types in humans *

Rhodium Rhodium is a chemical element with the symbol Rh and atomic number 45. It is a very rare, silvery-white, hard, corrosion-resistant transition metal. It is a noble metal and a member of the platinum group. It has only one naturally occurring isoto ...

, symbol Rh, a chemical element * R_H, the

Rydberg constant In spectroscopy, the Rydberg constant, symbol R_\infty for heavy atoms or R_\text for hydrogen, named after the Swedish physicist Johannes Rydberg, is a physical constant relating to the electromagnetic spectra of an atom. The constant first aro ...

for hydrogen *

Riemann hypothesis In mathematics, the Riemann hypothesis is the conjecture that the Riemann zeta function has its zeros only at the negative even integers and complex numbers with real part . Many consider it to be the most important unsolved problem in ...

, an important unsolved problem in mathematics

Places

RH postcode area The RH postcode area, also known as the Redhill postcode area,Royal Mail, ''Address Management Guide'', (2004) is a group of twenty postcode districts in South East England, within seventeen post towns. These cover east Surrey (including Redhill ...

, in the UK * , an official name of Croatia in Croatian *

Other uses

Rh (digraph) This is a list of digraphs used in various Latin alphabets. Capitalisation involves only the first letter (''ch'' becomes ''Ch'') unless otherwise stated (''ij'' becomes ''IJ''). Letters with diacritics are arranged in alphabetic order accordin ...

The Right Honourable ''The Right Honourable'' ( abbreviation: ''Rt Hon.'' or variations) is an honorific style traditionally applied to certain persons and collective bodies in the United Kingdom, the former British Empire and the Commonwealth of Nations. The term is ...

, an honorific preceding a name in the UK * Radical honesty, the practice of always being completely honest and refraining from telling even white lies

Companies

Science and technology

Places

Other uses

See also