https://en.wikipedia.org/wiki/Lorenz_system
Lorenz system
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Not to be confused with Lorenz curve or Lorentz distribution.
A sample solution in the Lorenz attractor when ρ = 28, σ = 10, and β = 8/3
The Lorenz system is a system of ordinary differential equations first studied by Edward Lorenz. It is notable for having chaotic solutions for certain parameter values and initial conditions. In particular, the Lorenz attractor is a set of chaotic solutions of the Lorenz system which, when plotted, resemble a butterfly or figure eight.