Sexagesimal, also known as base 60 or sexagenary, is a numeral system with sixty as its base

Using the thumb, and pointing to each of the three finger bones on each finger in turn, it is possible for people to count on their fingers to 12 on a single hand. A traditional counting system still in use in many regions of Asia works in this way, and could help to explain the occurrence of numeral systems based on 12 and 60 besides those based on 10, 20 and 5. In this system, a person's other hand would count the number of times that 12 was reached on their first hand. The five fingers would count five sets of 12, or sixty