Miller Indices
A system of notation used to identify crystallographic planes in a crystal lattice, defined by their intercepts with the crystallographic axes.
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The statement of the theorem
Given a crystal lattice defined by basis vectors and a plane intersecting the crystallographic axes at intercepts , the Miller indices are defined by the reciprocal relationship:\n\nThese indices are typically reduced to the smallest set of co-prime integers by multiplying by the least common multiple of the denominators.
Source: Wikipedia