| Cp− | C5H5−, MeC5H4− |
| CSD | Cambridge Structural Database |
| dt2− | dithiolene, cis-[R2C2S2]2− (R = CN, CF3) |
| dtc− | N,N’-diethyldithiocarbamate(1−), Et2NCS2− |
| Fd | ferredoxin |
| HP | high-potential protein (HiPIP) |
| L | generalized terminal ligand |
| M | generalized metal |
| [NC-M]− | [CpMn(CO)2CN]−, [W(CO)5CN]− |
| NHC | N-heterocyclic carbene |
| PDB | Protein Data Bank |
| [pyt]− | pyridine-2-thiolate(1−) |
| Q | generalized μ3-bridging ligand |