| Acronym | Meaning |
| IRR | Internal Rate Of Return |
| EGSB | Expanded Granular Sludge Bed |
| KIPO | Korean Intellectual Property Office |
| NPC | Nasopharyngeal Carcinoma |
| LLS | Linear-least Squares |
| PHS | Public Health Service |
| GWTR | Ground Water Treatment Rule |
| TDA-2PH | Two-particle One Hole Tamm-Dancoff Approximation |
| SCSOPW | Self-consistent Symmetrized Orthogonalized-plane-wave |
| UCMR | Unregulated Contaminant Monitoring Regulation |