| Acronym | Definition |
|---|
| SIGI➣Selective Insurance Group, Inc. (various locations) |
| SIGI➣Sisterhood Is Global Institute |
| SIGI➣Space Integrated GPS/INS (Global Positioning System/Inertial Navigation System; Honeywell International) |
| SIGI➣Saskatchewan Infrastructure Growth Initiative (Canada) |
| SIGI➣System for Interactive Guidance and Information |