Maybe I misspoke. There are two senses, a reflex S-curve as I intended is actually for statistics.
https://www.reference.com/math/ogive...2e505ca3a5ec74
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An ogive graph is a smooth S-shaped curve that is used in statistics. The graph is obtained by plotting the values of cumulative frequency against the upper boundary points of the class intervals.
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vs what I'd call a Gothic arch:
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Ogive
An ogive is the roundly tapered end of a two-dimensional or three-dimensional object. Ogive curves and surfaces are used in engineering, architecture and woodworking.
More at Wikipedia
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I thought this was an ogive:
