| Acronym | Meaning |
| MPAN | Peroxy Methacrolyl Nitrate |
| IAHR | International Association For Hydraulic Research |
| HFPD | Hartree-Fock With Proper Dissociation (wave Function) |
| WORM | Write Once Read Many |
| IAPA | Independent Asymptotic Pair Approxn. (in Electronic Structure) |
| PSF | Point Spread Function |
| NCEP | National Centers For Environmental Prediction |
| NPRI | National Pollutant Release Inventory |
| PDI | Polarization-division Interferometry |
| CV | Coeff. Of Variation |