| Acronym | Meaning |
 | PEDS | Plasma-enhanced Deposition System |
| PIAS | Photon-counting Image Acquisition System |
| SNPS | Space Nuclear Power System |
| PT-MVD | Perturbation Theory (with) Mass-velocity And Darwin (operators) |
| NARA | United States National Archives And Records Administration |
| RHFO | Relativistic Hartree-Fock One-channel (for Scattering) |
| HFS | Hartree Fock Slater |
| OEIC | Optoelectronic Integrated Circuit |
| SARA | Saturates |
| AVE | All Valence Electron |
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