| Acronym | Meaning |
| ISCA | Ionization Spectroscopy For Chemical Analysis |
| INDO/SP | Intermediate Neglect Of Differential Overlap/spin Polarization |
| TPPI | Time Proportional Phase Increment |
| DPN | Dip-pen Nanolithography |
| BAC-MP4 | Bond-additivity-corrected Moeller-Plesset 4th-order Perturbation |
| PPFD | Photosynthetic Photon Flux D. |
| GHF | Generalized Hartree-Fock Method |
| HFCVD | Hot Filament Chemical Vapor Deposition |
| DTRA | Defense Threat Reduction Agency |
| MTCT | Mother-to-child Transmission |