RB

Rb or RB may stand for:

In science and computing:

• Rebar (short for reinforcing bar), also known as reinforcing steel, reinforcement steel, a common steel bar, and is used in reinforced concrete structures
• Retinoblastoma, a childhood cancer of the eyes caused by a mutation in the retinoblastoma protein
• Retinoblastoma protein, a tumor suppressor protein
• Rubidium, a chemical element
• .rb, the file extension for documents created in Ruby or in REAL Basic

In transport and vehicles:

• RB, the IATA airline code for Syrian Arab Airlines
• re-entry body, the United States Air Force term for a re-entry vehicle
• Hyundai RB (buses), a series of Korean buses
• Nissan RB engine, a gasoline engine made by Nissan
• Réseau Breton, a French railway network in Brittany
• SJ Rb, a Swedish locomotive
• Regionalbahn, a type of train in Germany

In other uses:

• R. B. (nickname)
• Parti de la Renaissance du Bénin or Benin Rebirth Party, a political party in Benin
• Radio Bremen (RB), public broadcaster for the German state of Bremen
• Rancho Bernardo, a community in San Diego, California, United States
• Reckitt Benckiser, a company in United Kingdom
• Running back, a position in North America football
• Right back, a defensive position in association football
• Ray-Ban, a sunglasses company
• Rock Band, a music video game series or Rock Band (video game), the game of the same name
• Rowboat
• Rebecca Black, an American pop star
• Rupiah Banda, current President of Zambia
• República Bolivariana, Spanish-language phrase for the type of government in Venezuela.
• "Riding Buddy", a term of endearment used in British Columbia to identify one's favourite mountain biking partner.
• Regional Bulletin, a method of sending updates to all employees.
• The logo and initials for Rankin/Bass.
• R. B. Winter State Park, a park in Pennsylvania