| Acronym | Meaning |
| OIT | Oxidative Induction Time |
| OPPTS | Office For Prevention |
| STEREO | Solar TErrestrial RElations Observatory |
| WHH | Width At Half Height [in X-ray Diffraction] |
| OPC | Optical Particle Counter |
| CAM | Complex Angular Momentum (for Rotationally Inelastic Scattering) |
| PIMBE | Plasma-induced Molecular-beam Epitaxy |
| IAHE | International Association For Hydrogen Energy |
| MPD | Multiphoton Dissociation |
| SSSA | Soil Science Society Of America |