orthoplex

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English

A 16-cell, or 4-dimensional orthoplex (Schlegel diagram)
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Etymology

Coined in 1991 by John Horton Conway and Neil Sloane. Blend of orthant +‎ complex, since it has one facet for each orthant.

Noun

orthoplex (plural orthoplexes)

  1. (geometry) A convex polytope analogous to an octahedron (3 dimensions) or 16-cell (4 dimensions).
    • 1990, Mathematica Journal, volumes 1-2, page 84:
      We made use of another way of considering the 120 cells, starting with the eight at the vertices of an orthoplex, that is, in the cells of a hypercube.
    • 1991, J. H. Conway, N. J. A. Sloane, “The Cell Structures of Certain Lattices”, in Peter Hilton, Friedrich Hirzebruch, Reinhold Remmert, editors, Miscellanea Mathematica, page 90:
      It is remarkable that the four-dimensional orthoplex is the same polytope as the four-dimensional hemicube.
    • 2008, John H. Conway, Heidi Burgiel, Chaim Goodman-Strauss, The Symmetries of Things, page 412:
      The combinatorics of this case apply to all members of the Gosset series; in every case, their cells are simplexes and orthoplexes, the latter appearing with only half symmetry.

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References

  1. ^ Conway, J. H., Sloane, N. J. A. (1991) “The Cell Structures of Certain Lattices”, in Hilton, P., Hirzebruch, F., Remmert, R., editors, Miscellanea Mathematica, Berlin: Springer, →DOI, →ISBN, pages 89–90