Pinwheel Symmetry
Robert P. Munafo, 2003 Dec 30.
The more common type of rotational symmetry in the Mandelbrot set, involving two or more arms that spiral in to a point. Often the spiral is very subtle, as illustrated in the entry for R2F(1/3B*).
From the Mandelbrot Set Glossary and Encyclopedia, by Robert Munafo. Mu-ency index
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