| Acronym | Meaning |
| CAM | Computer-aided Manufacturing |
| USAN | US Adopted Names (for Drugs) |
| RECA | Regional Energy Convergence Approxn. (in Total Energies Calcns.) |
| RRM | Rayleigh-Ritz Method (for Quantum Calculations) |
| LEISS | Low-energy Ion-scattering Spectroscopy |
| ASMO | Antisymmetrical Molecular Orbital |
| ARC | AIDS-related Complex |
| BK | Brinkman-Kramers (approxn. In Ion-mol. Collision Quantum Calcn.) |
| ICCP | International Committee For Coal Petrology |
| SOP/EA | Split-operator Propagator (for) Electronically Adiabatic (phenomena) |