Two objects form a mirror pair if one can be translated and rotated in such a way that the two objects together possess mirror symmetry, i.e., one is the mirror image of the other one. One of the objects in a mirror pair is often called left-handed and the other one is called right-handed. If each object already possesses mirror symmetry, then both objects look the same.
Mirror Pair
See also
Mirror Image, Mirror Plane, Mirror SymmetryThis entry contributed by David Terr
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Terr, David. "Mirror Pair." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/MirrorPair.html