| Acronym | Meaning |
| GCOS | Global Climate Observing System (WMO |
| MRINDO/S | Modified Rydberg Intermediate Neglect Of Differential Overlap/spectral (or Screening) |
| AIR RISC | Air Risk Information Support Center |
| DLEED | Diffuse Low-energy Electron Diffraction |
| TMS | Transmission Moessbauer Spectroscopy ~ ~ |
| SCD | Supercritical Drying |
| FAAO | Free-atom Atomic Orbital |
| HFBR | High Flux Beam Reactor |
| ARXPD | Angle Resolved X-ray Photoelectron Diffraction |
| ILS | Intracavity Laser Spectroscopy |