| Acronym | Definition |
|---|
| GSSI➣Gatorade Sports Science Institute |
| GSSI➣Geophysical Survey Systems Inc. (North Salem, NH) |
| GSSI➣Group Short Subscriber Identity (amateur radio) |
| GSSI➣Genesis Strategic Solutions International LTD/LLC |
| GSSI➣Global Securities Services for Investors |
| GSSI➣Global Strategic Study Institute |
| GSSI➣Genesis Steel Services, Inc. (Baltimore, MD) |