Mandelbrot set Mandelbrot set /ˈmændəlˌbrɔːt sɛt/

noun

1. A set of complex numbers that has a highly convoluted fractal boundary when plotted; the set of all points in the complex plane that are bounded under a certain mathematical iteration  ( Mandelbrot set )
   a set of complex numbers that has a highly convoluted fractal boundary when plotted; the set of all points in the complex plane that are bounded under a certain mathematical iteration