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a kind of square with 11 sides
Every single kind of ball.
A Sphere
At the risk of being tautological, the answer is SPHERICAL.
A sphere has a single curved surface. It is said to have one surface. Further, the sphere has no "flat spots" or "angles" or "discontinuities" of any kind. It is a planar figure that is the set of all points equidistant from a single point, which is its center.A sphere has only one surface.