Geochart -Map Type [dz-all]

I’ve Geochart inside the Chart Set. I’m trying to figure out what is this map type called “dz-all” (see below snapshot) in the Geochart Properties.

Could anybody provide me with the information or the resource somewhere I could look into.
Thanks!

Priya

Those are country codes. Check: https://developers.google.com/chart/interactive/docs/gallery/geochart for references. DZ stands for Algeria.

In the linked article are all country codes available.

Janick