Answer based on context:

On August 6, 1945, towards the end of World War II, the "Little Boy" device was detonated over the Japanese city of Hiroshima. Exploding with a yield equivalent to 12,500 tonnes of Trinitrotoluene, the blast and thermal wave of the bomb destroyed nearly 50,000 buildings (including the headquarters of the Second General Army (Japan) and 5th Division (Imperial Japanese Army) and killed 70,000–80,000 people outright, with total deaths being around 90,000–146,000. Detonation of the "Fat Man" device exploded over the Japanese city of Nagasaki three days later on 9 August 1945, destroying 60% of the city and killing 35,000–40,000 people outright, though up to 40,000 additional deaths may have occurred over some time after that. Subsequently, the world’s nuclear weapons stockpiles grew.

Which device was detonated later, Little Boy or Fat Man?
Fat Man