Could be right and left symmetry.........

Chiral symmetry - Wikipedia

https://en.wikipedia.org/wiki/Left-right_symmetry

Wikipedia

(Redirected from Left-right symmetry) ... It is determined by whether the particle transforms in a right- or left-handed representation of the Poincaré group.

Facial symmetry - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Facial_symmetry

Wikipedia

Facial bilateral symmetry is measured via fluctuating asymmetry of the face ... theright side of the face will lead to an over-sized nose, while mirroring the left side