In the main claim of patent, how to express 0 as multiple? Is it better to write 0-N or 0-n? Or is it more direct to write 0 directly?

If there is more than one, 0 does not allow such descriptions, and 0 does not. Is this a technical feature? 1 means yes, and 0 means no. This is a qualitative change. I can't say that my product contains 0 grams of gold, but there is no gold. Similarly, if you have nothing, what do you want to do? To indicate that there is something, at least write 1, otherwise there is nothing, so even nouns cannot appear. If you want to write, you can only write a plan without sovereignty, write a subordinate claim with this technical feature, and then take the quantity as the next subordinate claim of some subordinate claims.