It in symmetry with sentence a is what? What is a sentence with symmetry in it?

This sentence with symmetry is symmetry with sentence this.

Reflection symmetry, reflectional symmetry, line symmetry, mirror symmetry, mirror-image symmetry, or bilateral symmetry is symmetry with respect to reflection

Line symmetry = Reflection symmetry.

Point symmetry = Rotational symmetry.

line symmetry, rotational symmetry, mirror symmetry &liner symmetry

A sponge has no symmetry, and is therefore asymmetrical.