| Acronym | Meaning |
| NTB | Nonorthogonal Tight-binding |
| XMPA | X-ray Electron Microprobe Analysis |
| MNDO/H | MNDO For H-bonded Systems |
| IUPPA | The International Union Of Air Pollution Prevention Associations |
| MAP3S | Multi-State Atmospheric Power Production Pollution Study |
| MALLS | Multiple-angle Laser Light Scattering |
| CNDO/2-U | Universal CNDO/2 (extended To Full Periodic Table) |
| RMP | Radon Measurement Proficiency |
| EBHT | Electron Beam Hardening Treatment |
| ROSE | Residual Oil Supercritical Extraction |