The invention of the zero is closely related to Indian scholars, especially Aryabhata in the 5th century and Brahmagupta in the 7th century. They worked with it as a number and a placeholder for the decimal system, going beyond the use of symbols for "nothing".
Quick Info:Al-Khwarizmi did not invent zero; he adopted it from Indian texts and systematically explained its use as a placeholder in the positional decimal system.