Ogive
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An ogive is the roundly tapered end of a two- or three-dimensional object. Ogive curves and surfaces are used in engineering, architecture, woodworking, and ballistics.
The ogive shape of the Space Shuttle external tank
Ogival curves in the ribs of Gothic vaulting at Worcester Cathedral UK
Pointed arches of Ibn Tulun Mosque in Cairo (9th century) prior to its restoration
Ogee
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An ogee is an object, element, or curve—often seen in architecture and building trades—that has a serpentine or extended S shape. Ogees consist of a double curve, the combination of two curves that, a
Ogive
…a "lancet arch". The most common form is an equilateral arch, where the radius is the same as the width. In the later Flamboyant Gothic style, an "ogee arch", an arch with a pointed head, like S-shaped curves, became prevalent. In glaciology, the term ogives refers to alternating bands of light and dark…
Gothic ogee arch from the 1300s, over a tomb effigy in recess, in St. Mary the Virgin, Silchester, in the United Kingdom.
An unorthodox ogee arch in Kilfane Church, Ireland (13th century)
Ogee clock, framed with ogee moulding.