What weapon was not used in world war 2?

One weapon that was not used in World War II is the atomic bomb in a conventional sense prior to its development and deployment. While the bombs dropped on Hiroshima and Nagasaki in 1945 were atomic weapons, the broader range of nuclear arms, such as thermonuclear or hydrogen bombs, were not utilized during the conflict. Additionally, many modern weapons, like drones and advanced cyber warfare tactics, were not available or used at that time.