rotational symmetry
Sometimes called turn symmetry. A geometric shape has rotational symmetry about a point O if it can be made to fit exactly onto the original when it is rotated about O through some positive angle less than one complete cycle.

For example, a square does not change if it is rotated through 90° about its center, and an equilateral triangle remains unchanged by rotation through 120° about its center.

Related Terms: glide-reflectional symmetry, line symmetry, point symmetry, symmetry, translational symmetry

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