Unity, completeness, infinity-the whole universe. 
-sphere. a combining form meaning “sphere,” “something spherical in shape” (hemisphere), used esp. in the names of the concentric layers of gases, water, rock, etc., characteristic of the earth or other celestial bodies (ionosphere; lithosphere). More generally, sphere has long had the primary sense of a ball or a body of globular form. Heavenly spheres refers to spherical surfaces containing planetary orbits. Since the 1600's sphere has had as one of its senses The region in which something or someone is active; one's province, domain. Sphere. A sphere is a perfectly round geometrical and circular object in three-dimensional space, such as the shape of a round ball. Like a circle, which, in geometrical contexts, is in two dimensions, a sphere is the set of points which are all the same distance r from a given point in space. This distance r is known as the radius of the sphere, and the given point is known as the center of the sphere. sphere. 1  great circle-Any circle on the surface of a sphere that lies on a plane through its center, or a circle that divides into two equal parts—as the Equator. 2  quadrant-A quarter of a circle or sphere. The volume of a sphere with radius r and diameter d = 2 r is. The sphere has the smallest surface area among all surfaces enclosing a given volume and it encloses the largest volume among all closed surfaces with a given surface area. The Sphere symbolizes wholeness. The sphere as a shape is an ancient and universal symbol that represents unity, completeness, infinity-the whole universe. Crystal spheres are often used to increase self awareness and a powerful mind. 1 great circle-Any circle on the surface of a sphere that lies on a plane through its center, or a circle that divides into two equal parts—as the Equator.
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what does a sphere represent?