icosahedron

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icosahedron

(ī-kō″să-hē′drŏn, kŏs″) [Gr. eikosaedron]
A nearly spherical structure made of 20 identical subunits linked at 12 symmetrical corners. Each subunit is an equilateral triangle. Several viruses, including the human immunodeficiency virus (HIV), are icosahedral.
References in periodicals archive ?
* Analogically, examine the relationship between the number of faces and vertices of a regular dodecahedron and a regular icosahedron.
1a, 1b), regular icosahedrons to regular dodecahedrons and vice versa.
The direct connection between the 3-D and 4-D spaces is realized when one equates the 120 group operations on the regular icosahedron (3, 5) to the vectors for the 120 vertices of the 600-cell hypericosahedron (3, 3, 5) in 4-D space in a particular way.