| Acronym | Meaning |
| AAD | Atomic Absorption Detector |
| CESR | Conduction Electron Spin Resonance |
| DDMO | Differential Density Matrix Overlap (index |
| HIMP | Heavy Ion Microprobe |
| RFGD | Radio-frequency Glow Discharge |
| NGPSA | Natural Gas Pipeline Safety Act |
| CINDO | Closed Shell Intermediate Neglect Of Overlap Method |
| FRC | Frozen Core Approxn. |
| NASP | National Aerospace Plane |
| PDAP | Poly(diallyl Phthalate) |