Explanation:

 For the invention of zero, most credit goes for 2 Indian mathematicians and astronomer Aryabhatta and Brahmagupta. Though Sumerians in Mesopotamia civilization, Babylonians, and Meso-americans also used zero as a symbol. The proper mathematical uses of zero started in the 7th century by Brahmagupta. An unknown Indian the most fundamental contribution of ancient India to the progress of civilisation is the decimal system of numeration including the invention of the number zero. This system uses 9 digits and a symbol for zero to denote all integral numbers, by assigning a place value to the digits. This system was used in Vedas and Valmiki Ramayana. Mohanjodaro and Harappa civilisations (3000 B.C.) also used this system..So,we can say Zero is invented by unknown Indian.