Claim: Little Boy is a cryptonym.
Evidence: `` Little Boy '' was the codename for the atomic bomb dropped on the Japanese city of Hiroshima on 6 August 1945 during World War II by the Boeing B-29 Superfortress Enola Gay , piloted by Colonel Paul W. Tibbets , Jr. , commander of the 509th Composite Group of the United States Army Air Forces.
A code name or cryptonym is a word or name used , sometimes clandestinely , to refer to another name , word , project or person.