| Acronym | Meaning |
| WSOEA | Wallace Second-order Eikonal Approximation |
| AIJ | Activities Implemented Jointly [related To Greenhouse Gas Control] |
| PAM | Performance Assessment Methodology |
| ISSC | International Subcommission On Stratigraphic Classification |
| PIMBE | Plasma-induced Molecular-beam Epitaxy |
| OELD | Organic Electroluminescent Device |
| IES | Internal Eliminated Sequence |
| PMT | Pasteurella Multocida Toxin |
| ASO | Atomic Spin Orbital |
| KHP | Potassium Hydrogen Phthalate |