| Acronym | Definition |
|---|
| SISN➣Società Italiana di Scienze Naturali (Italian: Italian Society of Natural Sciences) |
| SISN➣System and Information Sciences Notes (publication) |
| SISN➣Società Italiana per Gli Screening Neonatali |
| SISN➣Science Information Systems Newsletter (US NASA) |
| SISN➣Società Italiana di Spettroscopia Neutronica (Italian: Italian Society of Neutron Spectroscopy) |
| SISN➣Starfleet Italy Sim News (Star Trek) |
| SISN➣Studies in Special Needs (education course; various universities) |