Architecture Terms – D A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Rawpixel, CC BY-SA 4.0, via Wikimedia Commons Diaper PatternDecoration on the surface that consists of a repeating geometric or floral pattern. Photo by derek braithwaite, via Unsplash DomeA round roof that contains a circular base. If the structure is seen from different angles, it is shaped like an arch. Photo by Beto Galetto, via Unsplash DoorDoors have a variety of purposes, from securing the passage into a building (for safety and climate control) to the separation of interior spaces within the building (rooms, closets, etc.) for privacy, convenience, security, etc. Photo by Michaela Murphy, via Unsplash DormerA dormer is a window that protrudes outward from a roof. Photo by Katie Gerrard, via Unsplash DripstoneA projecting moulding that serves the purpose of throwing off rain above a door, window, and/or archway.