Some of the most important sorts of two-dimensional spirals include:
- The Archimedean spiral: (see also:Involute)
- The Euler spiral, Cornu spiral or clothoid
- Fermat’s spiral:
- The hyperbolic spiral:
- The lituus:
- The logarithmic spiral: ; approximations of this are found in nature
- The Fibonacci spiral and golden spiral: special cases of the logarithmic spiral
- The Spiral of Theodorus: an approximation of the Archimedean spiral composed of contiguous right triangles
- The involute of a circle, used twice on each tooth of almost every modern gear >>>>>>>>>>>>>>
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