As the formalism generates numerous species, there is a need for unambiguous and compact description/naming. Further, the abstract polytope representation of an atom-connectivity configuration is not particularly "human readable". The following compact descriptive system based upon the connectivity (using an adaptation of the kappa convention ) and PES character (local minimum LM, transition-state structure TS, etc.) of the species is suggested. For example, in Fig. species 6aa local minimum structure with the single bonder on site atom 16 -is LMκ16 and 7aa transition-state structure with the bonder bridging site atoms 16 and 17 -is TSκ 2 16,17. See Supplementary Information for more detailed descriptions.