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:
“It is beautiful to remember that he passed away as he wished, in the saddle riding hard.”
—Lyndon Baines Johnson (1908–1973)
“Of all illusions in the world, the most universally received is the concern for reputation and glory, which we espouse even to the point of giving up riches, rest, life, and health, which are effectual and substantial goods, to follow that vain phantom and mere sound that has neither body nor substance.”
—Michel de Montaigne (1533–1592)