| Acronym | Definition |
|---|
| SIZ➣Schweizerisches Informatik-Zertifikat (German: Swiss Computer Science Certificate; Switzerland) |
| SIZ➣Informatikzentrum der Sparkassenorganisation (Bonn, Germany) |
| SIZ➣Stahl-Informations-Zentrum (German: Steel Information Center) |
| SIZ➣Special Industrial Zone (Balochistan, Pakistan) |
| SIZ➣Seasonal Ice Zone |
| SIZ➣Sediment Impact Zone |
| SIZ➣Security Identification Zone |