The term 'glassed-in courtyard' is a description of an ATRIUM, which is a large open space surrounded by walls and usually covered with a glass roof. An ATRIUM is often found in the center of a building, and it can be used for a variety of purposes, such as providing natural light or creating a pleasant atmosphere. A glassed-in courtyard is an ATRIUM that has been enclosed with glass walls, allowing for more privacy and protection from the elements.