| Acronym | Meaning |
| PTI | Positive Thermal Ionization (for Mass Spectrometry) |
| GFCI | Ground Fault Circuit Interrupter |
| BGC | Biogeochemical Cycling |
| CISP | Canadian Indoor Source Profile |
| TEMO | Topological Effects On MO |
| NMMSS | Nuclear Materials Management And Safeguards System |
| SAR | Sequential Adiabatic Reduction |
| RARE | Retinoic Acid-response Element |
| NIPR | National Institute Of Polar Research |
| ATDHF | Adiabatic Time-dependent Hartree-Fock |