Oval



In geometry, an oval or ovoid (from Latin ovum, 'egg') is any curve resembling an egg or an ellipse. Unlike other curves, the term 'oval' is not well-defined and many distinct curves are commonly called ovals. These curves have in common that: The word ovoidal refers to the characteristic of being an ovoid.
 * they are differentiable (smooth-looking), simple (not self-intersecting), convex, closed, plane curves;
 * their shape does not depart much from that of an ellipse, and
 * there is at least one axis of symmetry.

Other examples of ovals described elsewhere include:
 * Cassini ovals
 * elliptic curves
 * superellipse

Egg shape
The shape of an egg is approximately that of half each a prolate (long) and roughly spherical (potentially even minorly oblate/short) ellipsoid joined at the equator, sharing a principal axis of rotational symmetry, as illustrated above. Although the term egg-shaped usually implies a lack of reflection symmetry across the equatorial plane, it may also refer to true prolate ellipsoids. It can also be used to describe the 2-dimensional figure that, revolved around its major axis, produces the 3-dimensional surface.

Projective planes
In the theory of projective planes, oval is used to mean a set of q + 1 non-collinear points in PG(2,q), the projective plane over the finite field with q elements. See oval (projective plane).