| Acronym | Meaning |
 | RDW | Relativistic Distorted Wave |
| UPS | Uninterrupted Power Systems (for Computer Networks) |
| ITMS | Ion Trap Mass Spectrometer |
| SLR | State And Local Relations |
| SSIMS | Static Secondary Ion Mass Spectrometry |
| NEKIA | National Education Knowledge Industry Association |
| LIESA | Laser Induced Emission Spectral Analysis |
| NASQAN | National Stream Quality Accounting Network |
| CIBS | Corrections To An Incomplete Basis Set (a Perturbation Theory) |
| PIES | Penning Ionization Electron Spectroscopy |
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