| Acronym | Meaning |
| HDI | High-density Inclusion |
| AAR | Association Of American Railroads |
| ACCDPPA | Approx. Coupled Cluster With Double Excitations Polarization Propagator Approxn. |
| EBI | Equivalent Background Illumination |
| SDSL | Site-directed Spin Labeling |
| IDA | International Desalination Association |
| PFPD | Pulsed-flame Photometer Detector |
| CHA | Concentric Hemispherical Analyzer |
| LOAEL | Lowest Observed Adverse Effect Level |
| ICP-MS | Inductively Coupled Plasma Mass Spectrometry |