Ogee_arch
Ogee
S-curved form used in woodworking, moulding, textile weaving, and architecture
An ogee (/oʊˈdʒiː/ /ˈoʊdʒiː/) is an object, element, or curve—often seen in architecture and building trades—that has a serpentine- or extended S-shape (sigmoid).[1]: 218 Ogees consist of a "double curve", the combination of two semicircular[citation needed] curves or arcs that, as a result of a point of inflection from concave to convex or vice versa,[1]: 218 have ends of the overall curve that point in opposite directions (and have tangents that are approximately parallel).[citation needed]
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First seen in textiles in the 12th century, the use of ogee elements—in particular, in the design of arches—has been said to characterise various Gothic and Gothic Revival architectural styles.[1]: 218 The shape has many such uses in architecture from those periods to the present day, including in the ogee arch in these architectural styles,[1]: 218 where two ogees oriented as mirror images compose the sides of the arch,[3] and in decorative molding designs, where single ogees are common profiles (see opening image).[1] The term is also used in marine construction.[citation needed] The word was sometimes abbreviated as o-g as early as the 18th century,[1]: 218 and in millwork trades associated with building construction, ogee is still sometimes written similarly (e.g., as O.G.).[citation needed]