Open-air rooms, also known as atria (5 letters), are indoor spaces that are open to the outdoors. They are typically roofed and have walls on three sides, with the fourth side open to the outdoors. These spaces are often used for outdoor activities such as dining, entertaining, or relaxing. They can also be used to bring natural light into a building. Open-air rooms provide a unique way to enjoy the outdoors while still being protected from the elements.