Spiral: nf A spiral is a curve that turns around an axis, forms a winding (helix, screw, volute).
Geometry: Plane curve which describes revolutions around a fixed point (or pole), deviating from it more and more. Archimedean spiral, where the radius vector is proportional to the polar angle.
Logarithmic spiral, which intersects all vector rays at the same angle.
In drawing: Open planar curve formed by connected circular arcs.
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