| Acronym | Meaning |
| HSX | Helically Symmetric Experiment |
| CVA-MO | Core-valence Approxn.-MO (for At. Integral Calcns.) |
| TDCS | Total Dissolved And Colloidal Solids |
| APMI | American Powder Metallurgy Institute |
| MTOF | Mass Time-Of-Flight |
| MEKP | Methyl Ethyl Ketone Peroxide |
| SULEV | Super Ultra-low Emission Vehicle |
| OPHF | Orbital-polarized Hartree-Fock |
| PEHX | Cross-linked |
| SAFIR | Single Aperture Far-Infrared Observatory |