| Acronym | Definition |
|---|
| TSIF➣The Sky Is Falling |
| TSIF➣Tooth Surface Index of Fluorosis |
| TSIF➣TSA (Transportation Security Administration) Systems Integration Facility (US DHS) |
| TSIF➣Transport Stream Interface |
| TSIF➣Trawsfynydd Strategic Integrated Framework (nuclear decommissioning project) |
| TSIF➣Thank Science It's Friday |
| TSIF➣Trichotillomania Support Information and Friends (Pittsburgh, PA) |
| TSIF➣This Space Intentionally Filled |