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:
“The dress makes the person; the saddle the horse.”
—Chinese proverb.
“Those who have mastered etiquette, who are entirely, impeccably right, would seem to arrive at a point of exquisite dullness.”
—Dorothy Parker (1893–1967)