| Acronym | Meaning |
| TVC | Total Viable Count |
| STHM | Scanning Thermal Microscopy |
| THCP | Total Hazard Control Plan |
| GSMT | Giant Segmented Mirror Telescope |
| LET | Linear Energy Transfer (in Spacecraft Power Systems) |
| MMVF | Man Made Vitreous Fibers |
| CSA | Coupled-subshell Approxn. (in Calcns. On Inner-shell Ionization Collisions) |
| TFA | Thomas-Fermi-Amaldi (equation) |
| LRCI | Low-rank Configuration Interaction |
| PEO | Poly(ethylene Oxide) |