| Acronym | Meaning |
| SDG | Signed Directed Graph (model) |
| AKD | Alkyl Ketene Dimer |
| TLEED | Tensor Low-energy Electron Diffraction |
| AAQS | Ambient Air Quality Standard (USEPA) |
| LSD-GX-CSEP | LSD-GX-with Correction Of Statistical Exchange Potential |
| ACC | 1-aminocyclopropane-1-carboxylic Acid |
| RVS-SCF | Reduced Variational Space-self-consistent Field (in Quantum Calcns. On Hydrogen Bonding) |
| EFB | Empty Fruit Bunch |
| ACRE | Automatic Climatological Recording Equipment |
| LED | Light-emitting Diode |