Spherical Shell
A spherical shell is a generalization of an annulus to three dimensions. A spherical shell is therefore the region between two concentric spheres of differing radii.
The spherical shell is implemented in the Wolfram Language as SphericalShell [{x, y, z}, {b, a}].
See also
Annulus, Ball, Chord, Sphere, Spherical HelixExplore with Wolfram|Alpha
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Cite this as:
Weisstein, Eric W. "Spherical Shell." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/SphericalShell.html