| Acronym | Meaning |
| LOPT | Lowest-order Perturbation Theory |
| NRO | Natural Reaction Orbital |
| AMN | Alkali Metal Nitrite(s) |
| LOCV | Lowest-order Constrained Variation |
| SPICE | Simulation Program With Integral Circuit Emphasis |
| SCOP | Structural Classification Of Proteins |
| SEE | Space Environment And Effects |
| EMAS | European Microbeam Analysis Society |
| ICF | Inertial Confinement Fusion |
| WOCE | World Ocean Circulation Experiment |