Symmetry (other Greek proportionality; from + measure together) , in the broad sense - conformity, immutability (invariance), manifested by any changes, transformations (for example: position, energy, information, other). So, for example, the spherical symmetry of a body means that the appearance of the body does not change if it is rotated in space at arbitrary angles (keeping one point in place). Bilateral symmetry means that the right and left sides with respect to any plane look the same.
The absence or violation of symmetry is called asymmetry or arrhythmia. General symmetry properties are described using group theory. Symmetries can be exact or approximate.
We have always been obsessed with symmetry, starting with a perfectly shaped fruit and ending with the impeccable Vitruvian Man by Leonardo da Vinci. The Symmetrical Monsters page on Instagram is a real delight for every perfectionist, because it is replete with all kinds of examples of symmetrical architecture.