What do a.m. and p.m. stand for?

space group

noun, Crystallography
a set of symmetry elements that brings a periodic arrangement of points on a Bravais space lattice to its original position. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for space group
  • Three of those pairs have no opposite sense or racemic screw axes within a single space group.
  • For transformation to the standard setting leave new space group symbol blank.

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