| Acronym | Meaning |
| ESTN | Electron Spin Transient Nutation |
| ICAO | International Civil Aviation Organization |
| PET | Positron Emission Tomography |
| NLMO | Nonorthogonal Localized Molecular Orbital |
| HPCCP | High Performance Computing And Communications Program |
| LCRA | Linear Combination Of Rydberg Orbitals |
| MSDS | Material Safety Data Sheets |
| QAMB | Quality Assurance Materials Bank (USEPA) |
| SNR | Supernova Remnant |
| BMRC | British Medical Research Council |