The π-conjugation and aromaticity are usually of primary interest for closed ring molecules, especially when they are nicely planar. Baryshnikov and co-workers demonstrated that diatropic ring current in ground-state C 18 comes from the two scaffolds of 18 π-electrons oriented in and out of molecular plane, respectively, proving the idea of double aromaticity for the carbon ring. Charistos and Muñoz-Castro reached the same conclusion by analyzing the contribution of the induced magnetic field from out-of-plane π-molecular orbitals (abbreviated as π out -MOs) and in-plane π MOs (abbreviated as π in -MOs) of some C 4n+2 ring. The work reported by Dai et al. revealed that C 18 is antiaromatic at its lowest excited state T 1 . Recently, we have extensively studied various properties and potential applications of C 18 and its derivatives, including the double aromaticity caused by two sets of π-electron systems of the C 18 and the substituent dependence of aromaticity of precursors C 18 (CO) n (n = 6, 4, and 2), by quantum chemistry calculations combined with a variety of wavefunction analysis methods. In the present work, we conduct theoretical calculations and analyses on electronic structure and aromatic characteristic of another important C 18 precursor, C 18 Br 6 , and focus on revealing their nature from the perspective of graphical representation.