| Acronym | Meaning |
| PSD | Particle Size Distribution |
| NCEP | National Centers For Environmental Prediction |
| ITC | Interagency Testing Committee (TSCA) |
| ESO | European Southern Observatory |
| CHAMPP | Computer Hardware |
| PDE | Partial Differential Equation |
| PSHF | Pseudospectral Hartree-Fock |
| COSAC | Cometary Sampling And Composition |
| RFWM | Resonant Four-wave Mixing |
| LIMB | Limestone Injection/multistage Burner |