| Acronym | Meaning |
| IS | Ionization Spectroscopy |
| ECR | Eriochrome Cyanine Rpar |
| TWTDS | Treatment Works Treating Domestic Sewage |
| MCCHF | Multiconfiguration Coupled Hartree-Fock |
| AMI | Active Microwave Instrument |
| BTX | Benzene, Toluene, And Xylene |
| PSB | Photosynthetic Bacteria |
| BSFC | Break Specific Fuel Consumption |
| IRAS | Infrared Astronomy Satellite |
| RDI | Reference Daily Intake |