| Acronym | Meaning |
| PMDL | Practical Method Detection Limit |
| PIRSS | Polarization IR Surface Spectroscopy |
| ISST | International Subcommission On Stratigraphic Terminology |
| PAO | Polyphosphate Accumulating Organism |
| ZLC | Zero Length Column |
| CELISA | Competitive Enzyme-linked Immunoabsorbent Assay |
| CNDO/B | Complete Neglect Of Differential Overlap / Boyd |
| HEXS | High-energy X-ray Scattering |
| MOSIS | Metal Oxide Semiconductor Implementation Service |
| RAS | Reflection-absorption Spectroscopy |