# Ra (disambiguation)

Ra is the Sun-god of Ancient Egypt.
Ra or RA may also refer to:

## Arts and entertainment
### Film and television

* Ra (Stargate), a character from the film Stargate, based on the Egyptian god
* Ra (1972 film), a 1972 documentary film about Thor Heyerdahl's expeditions
* Ra (2014 film), a Tamil fantasy film

### Gaming

* Rocket Arena, a Quake mod
* Command & Conquer: Red Alert, a game

### Music

* A half-step below Re on the solfège musical scale

#### Performers

* Ra (band), an American rock band
* Ra (musician), the pseudonym of Raoul Sinier, a French digital painter and electronic musician
* R.A. the Rugged Man (born c. 1974), American rapper
* Sun Ra (1914–1993), American jazz musician and philosopher
* Rise Against, an American punk/hardcore band

#### Albums

* Ra (Utopia album), 1977
* Ra (Eloy album), 1988

#### Songs

* "Ra", a song by Northlane from Node, 2015
* Ra (Inna song), 2018

### Other media

* Ra, a novel by qntm
* Ra (board game), a board game for two to five players designed by Reiner Knizia and based on ancient Egyptian culture
* Resident Advisor, an online magazine

## Businesses and organizations
### Academia

* Resource Academia, an academic institution in Lahore, Pakistan
* Roosevelt Academy, a college in the Netherlands
* Royal Academy of Arts, in London, UK
** Royal Academician, one of the 80 practicing artists elected as a member of the Royal Academy
* Resident assistant, a student leader

### Government, military, and political organizations

* Rainbow Alliance (Liberia), a political alliance in Liberia
* Regular Army, the permanent force of an army that is maintained during peacetime
* Regulatory affairs, a department in charge of industry-government relations
* Provisional Irish Republican Army, Irish Nationalist paramilitary group active during The Troubles
* Resettlement Administration, a New Deal government program in the United States
* Royal Artillery, a regiment of the British Army

### Other businesses and organizations

* Ramblers' Association, a UK organisation for walkers
* Registration authority, a body which maintains lists of international standards codes
* Rowing Australia, governing body for the sport of rowing in Australia
* Road America, which uses the logo "RA"; a racetrack in Wisconsin, USA
* Nepal Airlines (IATA code RA)

## Linguistics

* Ra (Javanese) (ꦫ), a letter in the Javanese script
* Ra (kana), the Japanese kana ら and ラ
* ረ and ራ, Amharic letters that can be read as variations of ra, also related to the Semitic resh
* Resh or rāʾ, 10th letter of Arabic alphabet
* Ռ or ṙa, the 28th letter in the Armenian alphabet
* र, ड़', ढ़, and र्ह, Devanagari letters which can be called ra, ṛa or rha
* Ԗ, the 23rd letter rha («ра») in the older (1924−1927) Moksha language Cyrillic script
* ர and ற, Tamil letters articulated as ra, tra or dra depending on the consonant complex

## Places

* Argentina, license plate code
* Ra (island) (or Rah), a small island of Vanuatu
* Ra Province in Fiji
** Ra (Fijian Communal Constituency, Fiji)
** Ra (Open Constituency, Fiji)
* Republic of Armenia
* Rawlins County, Kansas, of which the largest city is Atwood

## Religion and mythology

* Ra, the Sun-god of Ancient Egypt
* Rå, a creature in Scandinavian mythology
* Rā, a Māori word for the Sun that is also used in other Polynesian languages.
* Roua or Ra, a Polynesian deity
* Tama-nui-te-rā, a Maori Sun-god
* Radeyallāhu ′Anhu, an Islamic honorific.

## Science and technology
### Biology and medicine

* Retinoic acid, a metabolite of vitamin A
* Retrograde amnesia, a form of amnesia
* Rheumatoid arthritis, a chronic, systemic inflammatory disorder that attacks synovial joints
* Refractory anemia, an expression of myelodysplasia

### Computing

* .ra, the file extension for RealAudio files
* Registration authority, in public key cryptography
* RemoteAccess, a BBS software program
* Route Advertisement, in networking, part of the Neighbor Discovery Protocol

### Transportation

* SJ Ra, a Swedish locomotive
* Radar altimeter, an instrument on aircraft
* Resolution Advisory, an aircraft instruction from a Traffic Collision Avoidance System

### Other uses in science and technology

* $R_{a}$ or Ra, a popular parameter of roughness, defined as the average of absolute values of deviation from the mean of a surface
* Color rendering index ($R_{a}$), a measure of the ability of a light source to reveal the colors of objects faithfully
* Radium, symbol Ra, a chemical element
* Rain (METAR weather code RA)
* Rayleigh number, in physics
* Relation algebra, a type of mathematical structure
* Right ascension, in astronomy
* Risk analysis, in several fields
* Resource adequacy, in electrical power grids

## People with the surname

* Armen Ra, Iranian-born American musician
* Aron Ra, American author, podcaster, and atheist activist
* Ed Ra (born 1981), American politician

## Other uses

* Ra I and Ra II, reed boats used by Thor Heyerdahl's transatlantic expeditions
* Registered Architect, as a post-nominal suffix
* Remittance advice, a letter sent by a customer to a supplier, to inform the supplier that their invoice has been paid
* Research assistant, in academia
* Resident assistant, in college housing
* Republic Act, Philippine laws from 1946 to 1972 and after 1987
* One of several ISO 217 standard paper sizes
* "Ra", a disc golf midrange disc by Infinite Discs