It was a human invention. It did not exist in some dimension waiting to be discovered.
arjyabhatta, a great Indian astronomer
before 400BC by aryabhatt
The first real zero came from an Indian mathematician named Aryabhatta .
By the middle of the 2nd millennium BCE, the Babylonian mathematics had a sophisticated sexagesimal positional numeral system. The lack of a positional value (or zero) was indicated by a space...
zero discovered in India in 400 BC in maharashtra