cone
Cone-shaped building enclosing a tile-kiln, glass-furnace, etc. 2. Conical structure (e.g. the brick cone supporting the lantern in St. Paul’s Cathedral, London). 3. A small truncated cone of wood, steel, or plastic attached to a form tie to space and spread wall forms, leaving a neatly finished depression in the concrete surface to be filled or left exposed. 4. A solid whose surface is generated by a straight line, the generator, passing through a fixed point, the vertex, and moving along the intersection with a closed plane curve, the directrix. 5. A hollow molding, whose profile is usually a quarter of a circle. (Curl & Wilson, 2016)