| Acronym | Meaning |
| SSA | Spherical Sector Analysis |
| EPA | Environment Potential Approach (in Electronic-structure Calcn.) |
| ODEX | Optical Dynamics Experiments |
| LD | Lethal Dose |
| AFIS | Advanced Fiber Information System |
| CCOI | Coupled-channel Optical (potential Method With Only The) Imaginary (part Of The Complex Polarization Potential) |
| API | Atmosheric Pressure Ionization |
| VSM | Variable Screening Model (for Quasimols. And MO Correlation Diagrams) |
| FTICRMS | Fourier Transform Ion Cyclotron Resonance Mass Spectrometry |
| CISD | Configuration Interaction With Single And Double Excitation |