Nostalgia-COOL is a term used to describe something that is both RETRO and fashionable. It is a combination of the words 'NOSTALGIA' and 'COOL', which are often used to describe different aspects of popular culture. RETRO refers to something that is reminiscent of an earlier time, while COOL is used to describe something that is fashionable or stylish. NOSTALGIA-COOL is used to describe items or trends that have a vintage feel but are still considered fashionable.