A room with a skylight is also known as an ATRIUM, which is a six-letter word. An ATRIUM is a large open space, usually in the center of a building, that is surrounded by other rooms and has a skylight or other opening in the roof to allow natural light to enter. It is often used as a gathering place for people to meet and socialize. Atriums are common in modern architecture and can be found in many homes, businesses, and public buildings.