| Acronym | Meaning |
 | PPT | Parts Per Trillion |
| PTM | Perturbation Trajectory Method (in Gas-surface Collision Dynamics) |
| R-GVB | Resonating-generalized Valence Bond (wave Function) |
| AGMA | American Gear Manufacturers Association |
| HSX | Helically Symmetric Experiment |
| HRCT | High-Resolution Computed Tomography |
| FBTR | Fast Breeder Test Reactor |
| DMA | Differential Mobility Analyzer |
| HBT | Hanbury Brown Twiss (interferometry) |
| LRMA | Laser Raman Microanalysis |
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