| Acronym | Meaning |
 | PNA | Paraffins, Naphthenes, And Aromatics (in Petroleum Analysis) |
| STIS | Space Telescope Imaging Spectrograph |
| RPA | RNase Protection Assay |
| WSI | Wafer Scale Integration |
| CDD | Charge-density Distortion |
| OARM | Office Of Administration And Resources Management (USEPA) |
| AEP | American Electric Power (USA) |
| APSG | Antisymmetrized Product Of Separated Geminals |
| PACS | Physics And Astronomy Classification Scheme |
| ECNIMS | Electron Capture Negative Ionization Mass Spectrometry |
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