In general usage, symmetry most often refers to mirror or reflective symmetry; that is, a line (in 2-D) or plane (in 3-D) can be drawn through an object such that the two halves are mirror images ...

"Mirror symmetry already exists in vector optical ... fields and spin angular momentum and energy flow in the focal plane. We first propose the kaleidoscope-structured vector optical fields ...

In frontal symmetry, the left side of a building’s facade mirrors the right (the entrance usually being in the middle); in axial-plan symmetry, the rooms on one side of the axis are a mirror ...