| Abbreviation | Definition |
|---|---|
| SMS | Stock Market Simulation |
| SMS | Sun, Moon, And Stars |
| SMS | Special Mint Set |
| SMS | Spectral Modeling Synthesis |
| SMS | Simple Message System |
| SMS | Slow Moving Software |
| SMS | Sleep Management System |
| SMS | Supply Management Software |
| SMSCC | Shuttle Mission Simulator Computer Complex System |
| SMSI | Standard Manned Space Flight Initiator |
| SMSW | Store Machine Status Word |
| SMT | Surface Mount Technology |
| SMT | Selective Message Transaction |
| SMTAS | Shuttle Model Test and Analysis System |
| SMTF | Shuttle Mission Training Facility |
| SMTP | Simple Mail Transfer Protocol |
| SMU | Speaker/Microphone Unit |
| SMV | Silver Medal of Valor Award |
| SMVP | Shuttle Master Verification Plan |
| SMVRD | Shuttle Master Verification Requirements Document |
| SMW | Standard Materials Worksheet |
| SMWG | Software Management Working Group |
| SMY | Solar Maximum Year |
| SNA | System of National Accounts |
| SNA | Sympathetic Nerve Activity |
| SNAP | Sensory Nerve Action Potential |
| SNCS | Sensory Nerve Conduction Studies |
| SNDPZ | Syndicat National des Parcs Zoologiques |
| SNES | Suprascapular Nerve Entrapment Syndrome |
| SNF | System Noise Figure |
| SNF | Skilled Nursing Facility |
| SNH | Scottish National Heritage |
| SNIPES | Society of National Institute for Physical Education and Sports |
| SNIS | Space Network IP |
| SNMI | Survey of Non-Manufacturing Industries |
| SNMP | Simple Network Management Protocol |
| SNMP | Spatial Nutrient Management Planner |
| SNOW | Simulation for New Opportunities for Work |
| SNP | Single Nucleotide Polymorphism |
| SNR | Selective Nerve Root |
| SNS | Station Network Simulator |
| SNSO | Space Nuclear Systems Office |
| SNST | Sciatic Nerve Stretch Test |
| SNT | Serial Number Tracking |
| SNU | Solar Neutrino Unit |
| SNW | String Next Word |
| SNZ | Skip if Not Zero |
| SO | Section Officer |
| SO2 | Sulphur Dioxide |
| SOA | Stimulus Onset Asynchrony |