The history of the number zero stretches from early civilizations in the fertile crescent (now known as the Middle East) all the way into modern times. This means the question of who invented the number zero has no simple answer, since different civilizations expanded upon the concept over many thousands of years. The basic history of numbers, at least as far as the standard system used today, consists of numerals devised by many famous Arabian mathematicians; however, the first actual recorded use of the modern zero appeared on a carved stone in Cambodia hidden away from Khmer Rouge. Yes, the very first zero complete with rounded edges, as far as archeologists can tell, stems from the early Cambodian people.
Since zero represented a sum of nothing, it took ancient math many years to fully understand the idea of a zero sum needing representation. Yet many thinkers of the ancient world managed to conceive mathematical theories which relied upon numbers that one cannot physically see or count. Though the zero stands for nothing, the course of its development is anything but a history of nothingness.