| Acronym | Meaning |
| RCR | Replication-competent Retrovirus |
| ARRP | Acid Rain Research Program |
| MDI | Modified Dipole Interaction(model For Mol.-polarizability Calcn.) |
| RSAC | Remote Sensing Applications Center (US Forest Service) |
| SIR-C | Spaceborne Imaging Radar-C |
| SSHF | Spin-symmetrized Hartree-Fock (wave Function) |
| MD/MC-CEM | Molecular Dynamics/Monte Carlo-corrected Effective Medium |
| PEN | Personal Electronic Notebook |
| SCI | Super Configuration Interaction |
| CEARP | Comprehensive Environmental Assessment And Response Program |