A gable is the generally triangular portion of a wall between the edges of a sloping roof. The shape of the gable and how it is detailed depends on the structural system being used (which is often related to climate and availability of materials) and aesthetic concerns. Thus the type of roof enclosing the volume dictates the shape of the gable. In Classic Greek and Roman architecture, the analogous feature is called the tympanum. Strictly speaking, the tympanum is the infill area, often triangular, of the pediment, which also consists of the raking cornice or ends of the sloped roofs (which may appear to bear, but do not actually bear on the tympanum - the fact that many tympana bear intricate and expensive carvings declaring the building's purpose is evidence of its non-structural role), and the cornice proper, which bears on the architrave, which in turn is supported at points by columns of a colonnade. However for design purposes a gable can be combined into a hip roof. This is often seen over the garage door openings, and is popular on roofs all over Miami. This roof performs better in a storm than a true gable roof but not as well as a true hip roof.
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Another kind of roof to note is Polynesian Roof