A curve that turns around some central point, getting progressively closer to it or progressively farther from it, depending on which way the curve is followed. Among the best known types are the Archimedean spiral, the logarithmic spiral, the circle involute, and the lituus. Like their space-curve cousin the helix, all spirals are asymmetric and each comes in two forms that are mirror reflections of one another.
Related category PLANE CURVES
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