| Acronym | Meaning |
| CPT | Critical Pitting Temperature |
| CCCI | Correlation-consistent CI |
| PNR | Polarized Neutron Reflection |
| CRP | CAMP Receptor Protein |
| FMCW | Frequency Modulated Continuous Wave |
| HAZCOM | Hazardous Communication Plan |
| ROS | Restricted (or Roothaan) Open-shell (Hamiltonian) |
| CCGM | Cabrera-Celli-Goodman-Manson (at. Scattering Theory) |
| UCC | Unitary Coupled-cluster |
| CHIRP | Core-hole Initiated Relaxation Process (in Ionic Crystals) |