There is such a thing. But just because it has "law" in the name doesn't mean it's at all the same kind of thing as the "law" we usually think about. Call it

There is such a thing. But just because it has "law" in the name doesn't mean it's at all the same kind of thing as the "law" we usually think about. Call it "international common ground" if it makes you feel better or understand what it actually is better.