ICSS ZZ reflects the shielding of a system to the external magnetic field applied in the direction perpendicular to the ring plane in the whole three-dimensional space. If the external magnetic field is shielded/deshielded at a certain point, then ICSS ZZ will be locally positive/negative. The isosurface and color-filled map of ICSS ZZ of the C 18 Br 6 are presented in Figure ). The prominent shielding region inside the C 18 Br 6 and the circular deshielding isosurface around the ring further solidify the conclusion that C 18 Br 6 is aromatic, because this ICSS ZZ feature is universal in various aromatic molecules. The color-filled map of ICSS ZZ clearly shows the smooth transition of magnetic shielding effect inside the ring and the deshielding effect outside the ring.