| Acronym | Meaning |
| HMAC | Hazardous Materials Advisory Council |
| A/CNK | [Al2O3/(CaO + Na2O + K2O)] (Shand's Index) |
| IIXS | Ion Induced X-ray Spectroscopy |
| SRT | Sludge Or Solids Retention Time |
| EMU | Electromagnetic Unit |
| NABSA | Nucleic Acid Based Sequence Amplification |
| CC-CPA | Charge-correlated CPA |
| ICTP | Telopeptide Of Type-I Collagen |
| AFRSI | Advanced Flexible Reusable Surface Insulation |
| ATMS | Assumption-based Truth Maintenance System |