dihedral group

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dihedral group

n.
The group of rotations and reflections of a regular polygon.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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The 3.5 [Angstrom] resolution map showed that vault contains 78 MVP chains with 39-fold dihedral symmetry owing to the 39 MVP chains in each half-vault particle (Fig.
They present "symmetric icons" produced with dihedral symmetry, "quilts" produced with repeating patterns, and "symmetric fractals" produced with fractals.