What is the sharp edge of a building called?

The sharp edge of a building is typically referred to as a "cornice" when it is at the top edge, or simply an "edge" if referring to any sharp or defined boundary. In architectural terms, it can also be called a "verge" or "eaves" depending on its specific location and design. Additionally, in modern architecture, a pointed or angular edge might be described as a "blade" or "prow."