| Meaning | Category |
| Secondary Ion Mass Spectroscopy | Academic & Science->Electronics |
| Smart Integrated Monitoring System | Governmental->Military |
| Societal Institute of the Mathematical Sciences | Medical->Human Genome |
| Solaris Internet Mail Server | Computing->Networking |
| Stable Isotope Mass Spectrometer | Academic & Science->Ocean Science |
| Stock Exchange of Thailand Information Management System | Business->Stock Exchange |
| Student Information Management System | Academic & Science->Universities |
| Students For International Mission Service | Community->Religion |
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