A parallelogram (parallelepiped) containing the minimum repeatable elements of a circle (sphere) packing.
Unit Cell
See also
Circle Packing, Packing Density, Sphere PackingExplore with Wolfram|Alpha
References
Williams, R. "The Unit Cell Concept." §2-4 in The Geometrical Foundation of Natural Structure: A Source Book of Design. New York: Dover, pp. 48-51, 1979.Referenced on Wolfram|Alpha
Unit CellCite this as:
Weisstein, Eric W. "Unit Cell." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/UnitCell.html