Who is known as a father of abacus?

The title of "father of the abacus" is often attributed to the ancient Sumerians, who developed one of the earliest forms of counting devices around 3000 BCE. However, the term can also refer to later figures in history, such as the Chinese scholar Xu Guangqi, who played a significant role in popularizing the abacus in China during the Ming Dynasty. The abacus itself has evolved over millennia, with various cultures contributing to its design and functionality.