Where the bottom center section of the triangular gable is missing this is called an open pediment.
An open pediment has the centre of the base omitted. A broken pediment with double-curved sides is called a swan-neck pediment.Pedimental gableA segmental or shallow triangular gable treated as a pediment, i.e.
and Renaissance architecture above a portico, at the end of a building, or above doorways, windows, niches, etc.; sometimes the gable angle is omitted, forming a broken pediment, or the horizontal members are omitted, forming an open pediment.
in classical, Renaissance, and neo-classical architecture above a portico and above doors, windows, etc. It may be straight-sided or curved segmentally. Broken Pediment: one where the centre portion of the sloping sides is left open. Open Pediment: ...
pediment the architectural structure above a window, door, or porch -- either triangular or segmental (an arc, or segment of a circle); an open pediment has the center of its top missing, and a broken pediment has the center of its base missing.
OPEN PEDIMENT: a pediment in which the portion around the apex is omitted.
See also: Pediment, House, Ornament, Broken, Broken pediment
 
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