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The hexadecimal system.
Started in ancient Rome, this unique numbering system is widely used in many countries in the present time. Then in the the 9th Century America started to use roman numerals.
It uses the Binary Numbering System.
While most cultures have some form of numbering system, the numbering system (1,2,3,4, etc) most in use world-wide is actually Arabic in origin.
The Roman system of numbering came into common use in the 4th century BC. Before that, they used the Greek system of numbers.