| Acronym | Meaning |
| PNDDO | Partial Neglect Of Diatomic Differential Overlap |
| RA | Remedial Action |
| EGRET | Energetic Gamma Ray Experiment Telescope |
| SIOS | Semiclassical Infinite-order Sudden (in Rotationally-inelastic Scattering Calcns.) |
| BCG | Bacillus Calmette-Guerin |
| IEET | Intramolecular Electronic Energy Transfer |
| SNICS | Source Of Negative Ions By Cesium Sputtering |
| ETANN | Electronically Trainable Analog Neural Network |
| ABLE | Atmospheric Boundary Layer Experiments |
| SBP | Systolic Blood Pressure |