B21 may refer to:

Transportation

B21 (New York City bus) The Metropolitan Transportation Authority (MTA) operates a number of bus routes in Brooklyn, New York (state), New York, United States; one minor route is privately operated under a city government-granted monopoly, franchise. Many of them are th ...

, serving Brooklyn, New York City *

BSA B21 The BSA B21 was a British motorcycle made by Birmingham Small Arms Company (BSA) at their factory in Small Heath, Birmingham. Production started in 1937 and ended with the outbreak of World War II in 1939. Development After World War I, BSA st ...

(1937–1939), a British motorcycle made by Birmingham Small Arms Company, Birmingham, England *

Kepong–Selayang Highway Kepong–Selayang Highway (Selangor state route B21) is a major highway in Klang Valley region, Selangor, Malaysia. It is also a shortcut route to Rawang from Kepong and Sungai Buloh Sungai Buloh, or Sungei Buloh, is a town, a mukim (commu ...

(Selangor state route B21), Malaysia *

Leyland B21 The Leyland B21 was a bus chassis manufactured by Leyland between 1979 and 1985. The chassis was as used by the Leyland National and was designed for overseas markets.Volvo Redblock Engine The Volvo B21 is a slanted Inline-four engine, straight-four engine first used in the Volvo 200 series, meant to replace the Volvo B18 engine#B20, B20. The B21 and all derived engines are often referred to as ''red block'' engines for the red pai ...

, an automotive engine * A sports car built by

Chevron Cars Ltd Chevron Cars Ltd. is an English manufacturer of racing cars, founded by Derek Bennett in 1965. Following Bennett's death in 1978, the firm has remained active in various guises. The original company's designs and name continue to be used to ...

Other uses

B21 (band) B21 comprises brothers Bally and Bhota Jagpal. The duo — originally a trio with Jassi Sidhu, who left the band in 2002 — take their name from the Handsworth postcode in Birmingham, England. Discography "Darshan", which was featured in ...

, a British bhangra group *

B-21 (machine) The Northrop Grumman B-21 Raider is an American strategic bomber under development for the United States Air Force (USAF) by Northrop Grumman. As part of the Long Range Strike Bomber (LRS-B) program, it is to be a long-range, stealth interco ...

, a cypher machine invented by Boris Hagelin *

HLA-B21 HLA-B21 (B21) is an HLA - B serotype. B21 is a broad antigen serotype that recognizes the B49 and B50 split antigen serotypes. References {{HLA-B serotypes 2 ...

, an HLA - B serotype *

Northrop Grumman B-21 Raider The Northrop Grumman B-21 Raider is an American strategic bomber under development for the United States Air Force (USAF) by Northrop Grumman. As part of the Long Range Strike Bomber (LRS-B) program, it is to be a long-range, stealth intercon ...

, an American stealth bomber *

Boron-21 Boron (5B) naturally occurs as isotopes and , the latter of which makes up about 80% of natural boron. There are 13 radioisotopes that have been discovered, with mass numbers from 7 to 21, all with short half-lives, the longest being that of ...

(B-21 or ²¹B), an isotope of boron

Transportation

Other uses

See also