| Acronym | Definition |
|---|
| ISST➣IBM (International Business Machines Corporation) Software Services for Tivoli |
| ISST➣Fraunhofer Institut für Software- und Systemtechnik |
| ISST➣International Society of Schema Therapy |
| ISST➣Institute of Social Studies Trust |
| ISST➣Institut de Santé et de Securité Au Travail (Tunisia) |
| ISST➣International Schools Sports Tournament |
| ISST➣Indian Standard Strip (steel construction) |
| ISST➣In-Service Support Team |
| ISST➣Infrared Surveillance of Surface Targets |
| ISST➣Indian Standard Long Legged Tee Bar (steel construction) |
| ISST➣ICBM (Intercontinental Ballistic Missile) SHF (Super High Frequency) Satellite Terminal |