| Acronym | Meaning |
 | CIOS | Complex Infinite Order Sudden (approxn. In Quantum Calcns.) |
| IER | Ion Exchange Resin |
| GHRS | Goddard High Resolution Spectrograph |
| NSAID | Non-steroidal Anti-inflammatory Drug |
| BEJ | Best Engineering Judgement |
| SRP | Spreading Resistance Profiling |
| NIMS | Negative Ion Mass Spectrometry |
| IS | Ionization Spectroscopy |
| ISM | Intersecting Spheres Model (for Electronic-structure Calcns.) |
| REPELS | Reemitted Positron Energy Loss Spectroscopy |
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