Ah the History of the RPG huh?
Standing for Rocket propelled grenade. The RPG has its roots in the 20th century, with the early development of the explosive shaped charge. The development of practical rocketry provided a means of delivering such an explosive. Research, occasioned by World War II, produced such weapons as the American bazooka, and German Panzerfaust, which combined portability with effectiveness against armored vehicles such as tanks.
The Soviet Union-developed RPG-7 is the most widely distributed and used RPG in the world. The basic design of this RPG was developed by the Soviets shortly after World War II in the form of the RPG-2.