Tsar Bomba (Russian: Царь-бомба, literally "Emperor of bombs") is the Western name for the largest nuclear explosive ever detonated. Developed by the Soviet Union, the 57 megaton bomb was codenamed Ivan (Russian: Иван) by its developers.

They have the 'Tsar Bomb' the 'Tsar Cannon' the 'Tsar Bell' and they had the 'Tsar Tank' (that one is a big laugh). What is it about Russians and building large things? ;)

Tsar Bomba: Largest Thermonuclear Bomb Ever Built or Detonated