In the International System of Numeration, as it is being used we have ones, tens, hundreds, thousands, and then millions. One million is a thousand thousands. Commas are used to mark thousands and millions. It comes after every three digits from the right to left. The first comma marks thousands, and the next comma marks millions. For example, the number 60,801,592 is read in the International System as sixty million eight hundred one thousand five hundred ninety-two. In the Indian System, it is six crore eight lakh one thousand five hundred ninety-two.