What does HSZ mean?

Looking for the full meaning of HSZ? From the following image, you can find out all definitions of HSZ. If you want, you can also download image file to print.

HSZHellenic Subduction Zone
HSZHigh Security Zones
HSZHigh Signal Zones
HSZHrvatski Savez Zadruga
HSZHydrate Stability Zone

What does hsz stand for?