Definition:
Miller indices is a system of notation of planes within a crystal of space lattice. They are based on the intercepts of plane with thee three crystal axes, i.e. edges of the unit cell. The intercepts are measured in terms of the edge lengths or dimensions of the unit cell which are unit distance from the origin along three axes.
Miller evolved a method to designate a set of parallel planes in a crystal by three numbers h, k, and l, usually written within brackets thus (h, k, l) known as Miller indices of the plane.
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