| Acronym | Meaning |
| PTR | Proton Transfer Reaction |
| MHW MO | Mulliken-Helmholz-Wolfsberg Molecular Orbital |
| NTR | Nontranslated Region |
| AIPEA | Association Internationale Pour L'Etude Des Argiles |
| CVB | Canonical Valence Bond |
| NVM | Non-volatile Memory |
| PHF | Perturbative Hartree-Fock |
| CHO | Chinese Hamster Ovary |
| ECFS | Hot And Cold Potable Water (French; L'eau Chaude Et Froide Sanitaire) [a Class Of Pipe Application] |
| OPO | Optical Parametric Oscillator |