What were the two bombs dropped by the US called?

The two bombs dropped by the United States during World War II were called "Little Boy" and "Fat Man." "Little Boy" was dropped on Hiroshima on August 6, 1945, and was a uranium-based bomb. "Fat Man" was dropped on Nagasaki three days later, on August 9, 1945, and was a plutonium-based bomb. These bombings played a significant role in Japan's subsequent surrender and the conclusion of the war.