| Acronym | Meaning |
| RCHF | Relaxed-core Hartree-Fock (approxn. In Calcns. On Mol. K-shell Excitation Spectra) |
| PPO | Poly (phenylene Oxide) |
| CNES | Centre National D'Etudes Spatiales (French Space Center) |
| HPCCP | High Performance Computing And Communications Program |
| CFBC | Circulating Fluidized Bed Combustion |
| VCC-RIOS | Vibrational Close-coupled-rotational Infinite Order Sudden |
| DIGGER | Discrete Isolation From Gradient-governed Elimination Of Resonances |
| TSL | Thermally Stimulated Luminescence |
| RCR | Replication-competent Retrovirus |
| PM10 | Particulate Matter |