Proper noun
Tsar Bomba
A 50-megaton thermonuclear bomb, detonated by the Soviet Union in October 1961. It was the biggest nuke ever exploded.
To put that in perspective, the most powerful nuclear weapon ever created and tested - the USSR's Tsar Bomba, whose detonation shattered windows and caved in roofs hundreds of miles from the blast zone - had a yield of 50 megatons. Source: Internet
Immediately after successfully dropping Tsar Bomba, the Soviet air force promoted him to the rank of lieutenant colonel. Source: Internet