For aromatic molecules, the MOs responsible for aromaticity tend to generate an induced magnetic field in the direction opposite to the external magnetic field. By investigating the corresponding induced ring current or magnetic shielding effect, the electron conjugations of cyclic molecules can be deeply understood and the aromatic characteristics of the molecules can be reliably estimated. The diagram of anisotropy of the induced current density (AICD) of π-electrons (abbreviated as AICD-π), the component of iso-chemical shielding surfaces (ICSS) perpendicular to molecular plane (abbreviated as ICSSzz), and the gauge including magnetically induced current (GIMIC) are commonly used to investigate induced magnetic field from different perspectives.