What do white numbers mean?

That is, those who have not bought anything after registration, that is, those numbers that have no points. Generally, if you buy something, it will be counted after being praised by the seller. At that time, it was not white, white was clean, and now the meaning is a little different. It seems that as long as it is not 1, it is called a white number. What does Taobao white number mean? Taobao trumpet exists.