icosahedra - Hutchinson encyclopedia article about icosahedra Printer Friendly
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icosahedron
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icosahedron

Regular solid with 20 equilateral (equal-sided) triangular faces. It is one of the five regular polyhedra, or Platonic solids.
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Icosahedra also have locations around which there is threefold or twofold symmetry.
Armor-plated puzzle: deciphering the code of viral geometry by Weiss, Peter Ulrich / Science News
Regular icosahedra and dodecahedra are special forms of both icosahedral point groups, 235 and m35.
Quasicrystals by Cahn, John W. / Journal of Research of the National Institute of Standards and Technology
By contrast, in dimension three, the most symmetric kissing arrangement--the icosahedron--leaves wiggle room between the spheres and can't be extended to all of space, since icosahedra can't fill space without overlapping.
Oddballs: it's easier to pack spheres in some dimensions than in ... by Klarreich, Erica / Science News
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