Look up: BM-21

1. 
   BM-21
   122mm multi-barrelled rocket launcher series [SU;RU]
   Found on http://www.jedsite.info/index.html
   
   
2. 
   BM-21
   The `BM-21 `Grad`` is a launch vehicle of the Soviet 122 mm multiple-launch rocket system developed in the early 1960s. `BM` stands for 'combat vehicle' ; means 'hail'. In the West, the system was initially known as `M1964`. Grad is unquestionably the world`s most widely-used rocket artillery system. Its success in local conflicts has led other countries to copy it or to develop similar systems.
   Found on http://en.wikipedia.org/wiki/BM-21
   
   
3. 
   BMW E21
   `BMW E21` is the platform designation for the first BMW 3 Series compact executive car, produced by the German automaker BMW from 1975 to 1983. This series was the immediate successor to the BMW 2002 and was superseded by the BMW E30 platform.
   Found on http://en.wikipedia.org/wiki/BMW_E21
   
   
4. 
   BMW M21
   The `BMW M21` was a 2.4 L diesel straight-6 engine. It was introduced in 1983 with the BMW M20 design as its basis. It was available with a turbocharger. Applications: * 1986-1992 E28 524d/524td * 1987-1993 E30 324d/324td * 1987-1992 E34 524td * 1984-1985 Lincoln Continental
   Found on http://en.wikipedia.org/wiki/BMW_M21