Noun
English Wikipedia has an article on:Close-packing of equal spheresWikipedia
close-packing (plural close-packings)
The ordered arrangement of objects such as to create the greatest density (e.g. of atoms in a crystal).
Hexagonal close-packing involves stacking layers where every other layer is the same ("ababab"), whereas cubic close-packing involves stacking groups of three layers ("abcabcabc"). Source: Internet
Such a close-packing or spacefilling is often called a tessellation of space or a honeycomb. Source: Internet
For the close-packing of equal spheres the non-void fraction can be at most about 74%. Source: Internet