| Acronym | Meaning |
| NAVORDSTA | Naval Ordnance Station (US) |
| ECEC | European Center For Environmental Communication |
| DHS | Department Of Health Services |
| CHFPT | Coupled Hartree-Fock Perturbation Theory |
| PAR | Population At Risk |
| PIAMS | Photoionization Aerosol Mass Spectrometry |
| TSM | Thickness Shear Mode |
| NAPIM | National Association Of Printing Ink Manufacturers (US) |
| PCI | Perturbative Configuration Interaction |
| SIIA | Software & Information Industry Association |