In reflection symmetry, the reversed elements are arranged about a mirror line, and so are oppositely congruent , this is collectively known as reflection symmetry.
Symmetria is the greek term for measuring together.
We are symmetric creatures ourselves ( two arms, legs, eyes…) and have a strong tendency to think in opposites, left/right, good/bad…
At first, this system of proportion appears to be the most mundane expression of symmetry, but, in the final analysis, remains a principle of shear universality.
Most cosmologies have descriptions of archetypal opposites, shiva/shakti, anima/animus, and with the yin/yang symbol probably being the best known.
The meeting of the seemingly incompatible opposites creates transformation, a quantum leap in a new being.
The existence of reflection symmetry in the sakrosankt symbol achieves a sense of balance and harmony and inherently expresses the concept of polarity.