What is the architectural term for a triangle shape found above a horizontal structure?

The architectural term for a triangle shape found above a horizontal structure is known as a pediment. This feature is commonly found in classical architecture and is typically located above the entablature of a building, which is the horizontal framework that sits on top of the columns. Pediments can be decorative, often featuring sculptures or reliefs, and play a significant role in the overall aesthetics of the structure.

In architectural design, a pediment serves to create a visually appealing transition between the roof and the wall below, often enhancing the grandeur of a building. While gables are also triangular in shape, they refer specifically to the end wall of a pitched roof rather than an architectural feature above an element like a door or window. The term architrave pertains to a beam that spans the space between columns, and a frieze refers to a horizontal band that often contains decorative elements or inscriptions, typically found between the architrave and the ceiling or roof.