| Abbreviation | Definition |
|---|---|
| OSP | Omni Spectra Push |
| OSP | Open Source Physics |
| OSPL | Output Sound Pressure Level |
| OSQ | Orientation Space Quantization |
| OSTP | One Step Transition Probability |
| OSV | Optically Strong Variable |
| OTA | Optical Tube Assembly |
| OTT | optical topological transition |
| OW | One Wave |
| OXS | Objective Crystal Spectrometer |
| OZF | Ounces of Force |
| P | Predicted |
| P | Propagation |
| P | The Proportion |
| P&S | Permanent and Stationary |
| P=EI | Power in Watts |
| p6 | physics |
| PA | polar accelerometer |
| PAB | Physics Astronomy Building |
| PAB | Physics/Astronomy Building |