An object that is not superimposable on its mirror image is said to be dissymmetric. All asymmetric objects are dissymmetric, and an object with no improper rotation (rotoinversion) axis must also be dissymmetric. The opposite of dissymmetric is enantiomorphous.
Dissymmetric
See also
Amphichiral Knot, Chiral, Enantiomer, Enantiomorphous, Handedness, Mirror Image, ReflexibleExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Dissymmetric." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Dissymmetric.html