| Abbreviation | Definition |
|---|---|
| SNIM-2 | Spectrometer for Neutron Studies of Condensed Matter in a Pulsed Magnetic Field, Second generation |
| SNOLAB | Sudbury Neutrino Observatory LABoratory |
| SNPA | Standard Nuclear Physics Approach |
| SNR | SuperNova Remnant |
| SNS | Spallation Neutron Source |
| SNSS | Swedish Neutron Scattering Society |
| SOA | Spin Orbit Axis |
| SOC | Second Order Cone |
| SOC | Start Of Combustion |
| SOF | Separated Oscillatory Field |
| SOM | School of Metaphysics |
| SOP | Spin Orbit Parallel |
| SOPO | Statement Of Project Objectives |
| SOS | Spin Orbital Splitting |
| SOS | Stimulated Orientational Scattering |
| SOSF | Scanning Ocular SpectroFluorophotometer |
| SOT | Space Or Time |
| SP | Singular Perturbation |
| SP | Standard Pressure |
| SP | Superultramodern Physics |