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: • they are differentiable (smooth-looking), simple (not self-
intersecting), convex, closed, plane curves;, • their shape does not depart too much from that of a circle
or an ellipse, and, • there is at least one axis of symmetry. The word ovoidal refers to the characteristic
of being ovoid...
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Instantly accessorize bare wall-space with our Oval Ornament. Makes
great room or office accessories, fun favors for birthday parties, wedding
or baby shower Ornaments, or adding a unique, special touch to
gift-wrapped packages. Comes with its own festive red ribbon for
hanging. Hang 'em up!
* High quality porcelain
* Oval 2.3" x 3.25"
* Ribbon for hanging included
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In (a), a semicircle is joined to half an ellipse while in (b), two semicircles
are connected with straight line segments. Other ad hoc constructions
are often encountered as well.
This second oval shape is called a "rounded rectangle", not really an oval,
but racing tracks and sports fields of all sorts are called ovals while being
rounded rectangles.
Other examples of ovals described elsewhere include:
• Cassini ovals
• elliptic curves
• super ellipse
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 2D figure that,
revolved around its major axis, produces the 3D 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).
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