Fat Man: Plutonium-based Implosion-type bomb. Dropped in Nagasaki.
Second nuclear weapon to be deployed in warfare. Compare to "Little Boy", "Fat Man" has a stronger destructive power of 21 kilotons of TNT. It was also a part of the "Manhattan Project". Created by using purified graphite to slow down the movement of the neutrons to continue splitting atoms of Pu-239 (WNA). Its core was construct in University of Chicago (Encyclopedia of U.S. National Security; pg441), even so the government still kept it secret and used the University as a facility of weapon of mass destruction.
Bockscar
USAAF B-29 bomber, Bock's car which were ordered to drop "Fat Man" on Nagasaki.
B-29 Fortress Bomber named Bock's car which were ordered to drop "Fat Man" atomic bomb on Kokura in August 9, 1945. However, they are to drop Fat Man on Kokura due to the weather interference and decided to drop on Nagasaki (Cheek). The pilot of Bockscar is Charles W. Sweeney.