This is a Lorenz strange attractor It is notable for having chaotic solutions for certain initial conditions.

The lorenz system was developed to
describe a two dimensional fluid layer that is being warmed from below and cooled from above. **x**
is proportional to the rate of convection, **y** to the horizontal temperature variation, and
**z** to the vertical temperature variation. This demo shows a xy projection of the result and all three
coordinates in the time plot below.