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. WyrdLight.com, CC BY-SA 3.0, via Wikimedia Commons (cropped) Doric ColumnDoric columns typically have a simple, rounded capital at the top; a heavy, fluted or smooth column shaft; and no base. Architect of the Capitol 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.