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Reference.org
Spherical shell
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<p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, a spherical shell (a <a href="/facts/Ball_(mathematics)/f9vpMVMp">ball shell</a>) is a generalization of an <a href="/facts/Annulus_(mathematics)/rhxKuoem">annulus</a> to three dimensions. It is the region of a <a href="/facts/Ball_(mathematics)/f9vpMVMp">ball</a> between two <a href="/facts/Concentric/xR1I5N8y">concentric</a> <a href="/facts/Sphere/jywYLNM2">spheres</a> of differing radii. </p>