Ra_(disambiguation) Knowpia

Ra is the Sun-god of Ancient Egypt.

Ra or RA may also refer to:

Arts and entertainment edit

Ra (American band), an American rock band
Ra (artist), 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

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

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

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

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)

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

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

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

$R_{a}$ , 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

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