Origin in Zero

Well what stroke me about the articles was that the number 0 didn't exist for a little while. They would use some differents symbols to represent the number zero. Well in the aricles they don't say who discover zero. It only says where zero came from. So I don't really know who discovered it. But in the aricle there a person that came up with that maybe he might be who discovered the zero and maybe they just don't want to say it. Well the first evidence of the zero is the Sumerian Culture in 5,ooo years ago. Well I think that the number Zero is known by a lot of people especially for the ones who traveled and then they start to tell eachother.