Roosna-Alliku, Estonia

Ra I and Ra II, reed boats used by Thor Heyerdahl's transatlantic expeditions

Provisional Irish Republican Army (PIRA), as used by its sympathizers ("The 'RA")

Rage Against the Machine, rock band from L.A.

Rheumatoid arthritis, a chronic, inflammatory autoimmune disorder that causes the immune system to attack the joints

Retinol also known as retinoic acid (RA).

Registered Architect, a designer who is licensed by a government to practice architecture

The irreverent "Religious Advisor" of a Hash House Harriers club

Radium or Ra on the periodic table

Rise Against, melodic hardcore band from Chicago, Illinois, USA

Ra, the sun god of ancient Heliopolis

Regulatory Affairs, a department in charge of government relations within regulated industries

Royal Artillery, a Corps of the British Army

Relation algebra, a type of mathematical structure

A half-step below Re on the solfege musical scale

RA Nightclub at the Luxor Hotel in Las Vegas

Nepal Airlines, IATA code

The file extension of a RealAudio file

Roosevelt Academy, a small liberal arts college located in Middelburg in the Netherlands

Ra (Stargate), a character from the film Stargate

Resident assistant, a college student charged with supervising students living in a residence hall

Rocket Arena, a free mod for the multiplayer first-person shooter Quake series

Ra, a nickname, and US based signature couture fashion clothing line endorsed by Robin Arcuri, a supermodel and actress.

Ra (board game), a board game for three to five players designed by Reiner Knizia and based on ancient Egyptian culture

Ra (U.S. band), an American rock band

Radio altimeter

Ra Cailum class battleship, a class of spaceships in the Gundam anime universe

RemoteAccess BBS software

Right ascension, an astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system

Ras (disambiguation)

Rayleigh number, in physics

Resettlement Administration, a New Deal program under Franklin D. Roosevelt

Resident Advisor, an online electronic music magazine dedicated to the global dance music scene

Registration authority, maintenance agency is a body given the responsibility of maintaining lists of codes

Ra, Fiji, a province of Fiji

RA0 to RA4 are ISO 217 standard paper sizes

Ra (Norwegian band), a Norwegian psytrance act

Research assistant, a graduate student employed by a college or university for the purpose of academic research

Rå, a creature in Scandinavian mythology

Ra (kana), the Japanese kana ら and ラ

Rā, personification of the sun in New Zealand Māori mythology

RAH (disambiguation)

Radhiallahu 'anhu

Regular Army, the permanent force of the United States Army that is maintained during peacetime

Rowing Australia, the governing body for the sport of rowing in Australia.

Alternate spelling of Roua, a Polynesian deity

Royal Academician a member of the Royal Academy, also known as the Royal Academy of Arts

Ra, the pseudonym of Raoul Sinier, a french digital painter and electronic musician.

Robert Academy, the name for the former college section of Robert College of Istanbul

Rolling Acres, a dead mall in Akron, OH.

The abbreviation for Command & Conquer: Red Alert or its sequel Command & Conquer: Red Alert 2

Ra, the first studio album by the group Utopia

The Maori word for The Sun.