| Acronym | Meaning |
| QDA | Quadratic Discriminant Analysis |
| ANCA | Anti-neutrophil Cytoplasmic Antibodies |
| HGG | Hot Gas Generator |
| ALADDIN | Atmospheric Layer And Density Distribution Of Ions And Neutrals (NASA) |
| QRIOSA | Quantum Reactive Infinite Order Sudden Approxn. |
| STEM | Scaled Taylor Exponential Model |
| FIMS | Fine-split IR Multispectral Scanner (for Remote Sensing) |
| MDQ | Minimum Detectable Quantity |
| NPD | Normal Photoelectron Diffraction |
| ACTS | Advisory Committee On Toxic Substances |