| Acronym | Meaning |
 | CSA | Coupled-subshell Approxn. (in Calcns. On Inner-shell Ionization Collisions) |
| APS | Autocorrelation Photon Spectroscopy |
| NMOC | Nonmethane Organic Compound(s) |
| NCS | Notification Of Compliance Status |
| UARS | Upper Atmosphere Research Satellite |
| LCAS MS | Linear Combination Of Atomic Spinors-molecular Spinors |
| NPD | Normal Photoelectron Diffraction |
| DOJ | U.S. Department Of Justice |
| IRAS | Infrared Astronomy Satellite |
| BOC | Bond-order Conservation (model In Calcns. On Reactions) |
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