Note the nipple points and the cleve point.
In mathematics, a saddle point is a point in the domain of a function that is a stationary point but not a local extremum. The name derives from the fact that the prototypical example in two dimensions is a surface that curves up in one direction, and curves down in a different direction, resembling a saddle or a mountain pass. In terms of contour lines, a saddle point in two dimensions gives rise to a contour that appears to intersect itself.
Read more about Saddle Point: Mathematical Discussion, Other Uses
Famous quotes containing the words saddle and/or point:
“As the saddle makes the horse, so the tailor makes the man.”
—Chinese proverb.
“There’s a point of poverty at which the spirit isn’t with the body all the time. It finds the body really too unbearable. So it’s almost as if you were talking to the soul itself. And a soul’s not properly responsible.”
—Louis-Ferdinand Céline (1894–1961)