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Circular symmetry
 | This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (February 2017) |
 In 2-dimensions an archery target has circular symmetry. |
 A surface of revolution has circular symmetry around an axis in 3-dimensions. |
In geometry, circular symmetry is a type of continuous symmetry for a planar object that can be rotated by any arbitrary angle and map onto itself.
Rotational circular symmetry is isomorphic with the circle group in the complex plane, or the special orthogonal group SO(2), and unitary group U(1). Reflective circular symmetry is isomorphic with the orthogonal group O(2).
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