| Acronym | Meaning |
| SID | Selected Ion Detection |
| NCMET | Nonclosed Shell Many Electron Theory |
| NMHC | Nonmethane Hydrocarbons |
| SCLM | Scanning Confocal Laser Microscopy |
| ICHAZ | Intercritical Heat-affected Zone |
| SNAP | System For Nuclear Auxiliary Power |
| ALEX | Aerosol LIDAR Experiment |
| MACHO | Massive Compact Halo Object |
| LSDF | Local Spin Density Functional |
| MMAD | Mass Median Aerodynamic Diameter (aerosol) |