| Acronym | Meaning |
| COS | Corona Oxide Semiconductor |
| MO | Molecular Orbital |
| OEM | Original Equipment Manufacturer |
| APD | Air Particulate Detector |
| ELO | Equivalent Localized Orbitals |
| CIPM | Comite International Des Poids Et Mesures |
| CGC | Cerebellar Granule Cells |
| ETP | Emerging Technology Program (USEPA SITE) |
| NWEA | National Wood Energy Association |
| OCCSD | Open-shell Coupled-cluster (with) Single (and) Double (excitations) |