| Acronym | Meaning |
| TSM | Total Suspended Material |
| CCM | Cyclic Cluster Model (in CNDO For Deep Levels In Solids) |
| IRGL | Interagency Regulatory Liaison Group |
| LVDT | Linear Variable Differential Transformer |
| BRM | Biological Response Modifier |
| GCRIO | Global Change Research Information Office |
| STOIIP | Stock Tank Oil Initially In Place |
| IISI | International Iron And Steel Institute |
| AEROCE | Atmosphere-Ocean Chemistry Experiment |
| AMO MT | Alternant Molecular Orbital Matsubara-Toyozawa Method |