Numbers vs Symbols Secret history
The image was not created without basis. During the infancy of the Hindu-Arabic numeral system, the way of writing numbers that we use today, a system of counting angles as shown above was adopted. This was shortly after the release of two books namely On the Calculation with Hindu Numerals by al-Kwharizmi (about 825 AD) and On the Use of Indian Numerals by Abu Yusuf Yaqub Ibn Ishdaq al-Kindi (830 AD). These two books popularized the use of Hindu-Arabic numerals in the Middle East.
As we all know, eventually the Hindu-Arabic way of writing numbers and computations replaced the Roman Numerals.