| Abbreviation | Definition |
|---|---|
| ISSI | Imaging Solutions and Services Inc |
| ISSI | Imaging Solutions Services Inc |
| ISSI | Industrial Stainless Supply Inc |
| ISSI | Industrial Supply Solutions Inc |
| ISSI | Information Systems Staffing, Inc. |
| ISSI | Innovative Scientific Solutions Inc |
| ISSI | Innovative Security Services Inc |
| ISSI | Integrated Sales Solutions Inc |
| ISSI | Integrated Science Solutions Inc |
| ISSI | Integrated Silicon Solution Inc |
| ISSI | Integrated Spatial Solutions Inc |
| ISSI | Integrated Support Solutions Inc |
| ISSI | Integrated systems Solutions Inc |
| ISSI | International Steel Services Inc |
| ISSL | International Stemcell Services Ltd |
| ISSL | Internet Solutions Services, LTD. |
| IST | Information Solutions for Telemedicine |
| ISTA | International Selling And Trade Association |
| ISTG | Immigrant Ships Transcribers Guild |
| ISTI | Instrumental Software Technologies, Inc. |