| Acronym | Meaning |
| PIR | Protein Identification Resource |
| MASP-HMO | Mutual Additive Substituent Parameter-Hueckel Molecular Orbital |
| RFI | Radio Frequency Interference |
| ANP | Atrial Natriuretic Peptide |
| QEEC | Quasimol. Extended Elementary Cell (for Electronic Structure Calcns. Of Crystals) |
| LCFC | Linear Combination Of Fragment Configuration |
| LCPH | Localized Chemical Pseudopotential Hamiltonian |
| WSF | Water Soluble Fraction |
| SIR-C | Spaceborne Imaging Radar-C |
| ECOP | Electron Correlation Polarization (potential) |