| Acronym | Meaning |
 | CS | Coupled-states (or Centrifugal Sudden) Approximation |
| GPS | Generalized Phase Shift Formalism |
| HIBS | Heavy Ion Backscattering Spectrometry |
| HMIX | Hazardous Materials Information Exchange |
| PBMS | Photon Burst Mass Spectrometry |
| HEM | Human Exposure Model |
| OPEC | Organization Of Petroleum Exporting Countries |
| RCCSD | (spin) Restricted CCSD |
| NEPP | National Energy Policy Plan |
| NSRDS | National Standard Reference Data System |
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