Zero

Around 500, an Indian mathematician suggested using the symbol "0" to represent an untouched abacus level. This came to the Arabs and was used in Al-Khwarizmi's book on algebra.
 Muhammad bin Al-Khwarizmi Arabia 810 Zero

Around 500, an Indian mathematician suggested using the symbol "0" to represent an untouched abacus level. This came to the Arabs and was used in Al-Khwarizmi's book on algebra.