B21 comprises brothers Bally and Bhota Jagpal.
Boris Caesar Wilhelm Hagelin (2 July 1892 - 7 September 1983) was a Swedish businessman and inventor of encryption machines.
HLA-B21 (B21) is an HLA - B serotype.
The Metropolitan Transportation Authority (MTA) operates a number of bus routes in Brooklyn, New York, United States; one minor route is privately operated under a city franchise.
The North American XB-21, also known by the manufacturer's model designation NA-21, and sometimes referred to by the name "Dragon", was a prototype bomber aircraft developed by North American Aviation in the late 1930s, for evaluation by the United States Army Air Corps.
The Northrop Grumman B-21 Raider is a heavy bomber under development by Northrop Grumman. As part of the Long Range Strike Bomber program (LRS-B), it is to be a very long-range, stealth strategic bomber for the United States Air Force capable of delivering conventional or thermonuclear weapons. The bomber is expected to enter combat service by 2025. It is to complement existing Rockwell B-1 Lancer, Northrop Grumman B-2 Spirit and Boeing B-52 Stratofortress bomber fleets in U.S. service and eventually replace these bombers.
The Volvo B21 is a slant straight-4 engine first used in the Volvo 200 series, meant to replace the B20.