Pier (architecture)
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In architecture, a pier is an upright support for a superstructure, such as an arch or bridge. The cross section of the pier is generally square, or rectangular, although other shapes are also possible. In medieval architecture, massive circular supports called drum piers, cruciform (cross-shaped), and composite piers are common.
In buildings that are designed as a sequence of bays, each window or door opening between piers is considered a single bay.