| Acronym | Meaning |
| ARAC | Acid Rain Advisory Committee |
| LDA | Linear Diode Array |
| GS | Gelius-Siegbahn (MO Approxn.) |
| FIA | Flow Injection Analysis |
| NDR | Neg. Differential Resistance |
| AU | Absorbance Units |
| EIFS | Exterior Insulation And Finish Systems [coatings] |
| SLAPW | Superlinearized Augmented Plane Wave |
| CCAP | Crustacean Cardioactive Peptide |
| PWETF | Plane-wave Electronic Translational Factor (ion-atom Collisions) |