| Acronym | Meaning |
| ORU | In Orbit Replaceable Unit (spacecraft) |
| PTGS | Post-transcriptional Gene Silencing |
| HDM | Humic Degradation Matter |
| RMT | Random Matrix Theory |
| ATA | Anaerobic Toxicity Assay |
| TMA | Thermomechanical Analysis |
| IC-ACPF | Internally Contracted (multireference) Averaged Coupled Pair Functional |
| TENR | Technologically Enhanced Natural Radioactivity |
| TACT | Trans Alaska Crustal Transect |
| OKE | Optical Kerr Effect |