| Acronym | Meaning |
| RVD | Regulatory Volume Decrease |
| TBN | Total Base Number |
| LAAFS | Laser Ablation Atomic Fluorescence Spectroscopy |
| AS | Auger Spectroscopy |
| HSEES | Hazardous Substances Emergency Events Surveillance |
| UPVC | Unplasticized Poly(vinyl Chloride) |
| MRO | Medium Range Order |
| MPDS | Moment-polarized Dirac-Slater |
| VPSEM | Variable Pressure Scanning Electron Microscope |
| HEB | High Efficiency Boiler |