| Acronym | Meaning |
| ACT | Alternative Control Technique |
| HMM | Half Molecule Model (for Electron Scattering By Molecules) |
| AMS | American Mathematical Society |
| TCO | Transparent Conducting Oxide |
| CGA | Colloidal Gas Aphron |
| HOFF | Hybrid Orbital Force Field |
| HEB | High Efficiency Boiler |
| PISA | Pharmaceutical Information Systems Association |
| SCC | Stress-corrosion Cracking |
| CLRTAP | Convention On Long-Range Transboundary Air Pollution |