Mandelbrot Set -- from Wolfram MathWorld
Mandelbrot.
Fractals from
mathworld.wolfram.com
by EW Weisstein · 2002 ·— The term Mandelbrot set is used to refer both to a general class of fractal sets and to a particular instance of such a set. In general, a Mandelbrot set marks the set of points in the complex plane such as a Julia set.