LOL-π and ELF-π refer to the LOL and ELF functions that are solely contributed by π-electrons, respectively. They are highly useful for visually examining the bonding effects and delocalization of π-electrons and are widely applied in research on aromaticity. Relatively speaking, the graphical representation of LOL-π is slightly more ideal than that of ELF-π, making LOL-π our preferred choice. Fig. shows the LOL-π isosurface map of the experimentally synthesized twisted carbon nanobelt by Wu et al. The isosurfaces cover a wide range of space, suggesting that the π-electrons can easily delocalize within the corresponding regions. However, at certain locations, indicated by the pink arrows, the very narrow isosurfaces imply that it is difficult for π-electrons to delocalize through these areas. sp 3 hybridized carbons do not have π-electrons, so their regions are completely uncovered by the LOL-π isosurfaces. This example highlights the convenience of using LOL-π to reveal the distribution and behavior of π-electrons.