| Acronym | Meaning |
| FDSO | Full Diagonal Second-order (approxn. To)-green Function |
| NEEIA | Nonseparation Electrochemical Enzyme Binding/immunoassay |
| TDPAD | Time Differential Perturbed Angular Distribution |
| DSMS | Depth-selective Moessbauer Spectroscopy |
| OHMTADS | Oil And Hazardous Materials Technical Assistance Data System |
| BOREAS | Boreal Ecosystem - Atmosphere Exchange Study |
| ODC | Optimized Double Configuration |
| HKS | Hohenberg-Kohn-Sham (quantum Theory) |
| NARS | National Asbestos Registry System |
| OCT | Optical Current Transducer |