| Acronym | Meaning |
| NFT | Neurofibrillary Tangle |
| NPD | Normal Photoelectron Diffraction |
| CAR | Computer Aided Retrieval |
| RMRCI | Relativistic MR-CI |
| DC | Blood-air Distribution Coefficient |
| DIM | Dissolved Inorganic Matter |
| BTUGA | Bonded Tableau Unitary Group Approach |
| PPM | Pair Population Method |
| FFFSG | Fossil Fuel Fired Steam Generator |
| OETP | Orbiter Electron Temp. Probe |