http://en.wikipedia.org/wiki/Lee_distance

In coding theory, the Lee distance is a distance between two strings x1x2...xn and y1y2...yn of equal length n over the q-ary alphabet {0,1,…,q-1} of size q >= 2. It is metric.

If q = 2 or q = 3 the Lee distance coincides with the Hamming distance.

The metric space induced by the Lee distance is a discrete analog of the elliptic space.

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