| Acronym | Meaning |
| PGP | Previous Glacial Period (glacial Maximum Of O18 Stage 6; Predates The LGM) |
| ASE | Aromatic Stabilization Energy |
| DARPA | Defense Advanced Research Projects Agency (Department Of Defense) |
| MBAS | Methylene Blue Active Substance (surfactant) |
| CAE | Capillary Affinity Electrophoresis |
| NRA | National Rivers Authority (UK) |
| SIC | Self-interaction Correction (in Exchange-energy Calcns.) |
| BHK | Baby Hamster Kidney |
| PNO-CI | Pseudonatural Orbital-configuration Interaction |
| GO | Generalized Overlap |