I know they are Indian. I am from South Asia. However, the modern system was first created in Arabic. Also, I am talking about the placement of the digits, and this came to Europe from Arabic, not Brahmi.
The entire time the positional notation didn't change with alphabet
Actually, the modern positional system was created, in its entirety, in India. This includes the use of zero.
al-Khwarizmi gets credit largely for introducing the Indian system to the Arabic and Western world. He is the reason that the Arabs and Europeans use Indian numerals, though they've since mutated in look over time.