dissymmetry(n = noun.attribute) asymmetry, imbalance - (mathematics) a lack of symmetry;
is a kind of spatial property, spatiality
has particulars: geometrical irregularity, irregularity, lopsidedness, skewness, radial asymmetry, handedness, laterality, footedness, eyedness

dissymmetry, n. (pl. -ies)
1 a lack of symmetry. b an instance of this.
2 symmetry as of mirror images or the left and right hands (esp. of crystals with two corresponding forms).

Derivative:
dissymmetrical adj.