| Acronym | Meaning |
| RPD | Retarding Potential Difference |
| DFA | Dual Fouling Apparatus |
| ASQ | Axle Shaft Quality |
| ERP | Emergency Response Planning |
| LMCT | Ligand-to-metal Charge Transfer |
| BTB | Bromothymol Blue |
| HCOT | Helically Coiled Open Tube |
| RSM | Reduction Symmetry Method (in Crystal Field Theory) |
| NOEL | No Observable Effect Level (in Animal Tests) |
| DPUMPN | Double-annihilation Procedure Unrestricted Moeller-Plesset Nth-order |