| Acronym | Definition |
|---|
| SNSI➣Sunbelt Network Security Inspector |
| SNSI➣Senior Naval Science Instructor (various schools) |
| SNSI➣Scuba Nitrox Safety International (Topsham, ME) |
| SNSI➣Spay-Neuter Services of Indiana, Inc (Indianapolis, Indiana) |
| SNSI➣Secret National Security Information |
| SNSI➣Safe Net Secure Internet |