I have a set of map tiles that follow the typical quad tree format however, at level 0 (zoomed all the way out), I have two tiles instead of the expected 1. The tiles also follow a {z}/{y}/{x} numbering system. What is this system called? I don't see this format listed on Wikipedia - Tile Web Map. I need a name to help find internet search results.
This is what I have for level 0.
- 0/0/0.png
- 0/0/1.png