pediment
A peaked gable on top of a set of columns or pilasters.
Pediments can rest on top of a row of evenly spaced columns, or they can be supported by columns flanking a portal (an entryway or a window), or even flanking a solid wall.
Pediments are especially common in Classical Greek, Classical Roman, Renaissance, Mannerist, Baroque, Neo-Classical, Neo-Renaissance, Neo-Baroque, and Postmodernarchitecture,