Batman and Robin are a legendary DUO in the world of comic books. They are known as the Dynamic DUO, and have been fighting crime together since their first appearance in Detective Comics #38 in 1940. The two characters have become iconic figures in popular culture, and their partnership has been immortalized in various forms of media, from television shows to movies. The term 'DUO' is often used to refer to the two characters, while 'Dynamic DUO' is a more specific term that refers to their crime-fighting partnership.