RH

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title: "RH" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public topic_path: "uncategorized" source: "https://en.wikipedia.org/wiki/RH" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

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
• Reproductive health
• Rh blood group system (Rhesus factor), a classification to describe blood types in humans
• Rhodium, symbol Rh, a chemical element
• RH, the Rydberg constant for hydrogen
• Riemann hypothesis, an important unsolved problem in mathematics
• Adobe RoboHelp, an Adobe software

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
• DZRH News Television, a news channel in the Philippines previously known as RHTV.

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