Let us learn about numeral most commonly
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The most commonly used system of numerals is called as Hindu-Arabic numerals & 2 great Indian mathematicians are credited with developing them. Aryabhata & Brahmagupta.
A numeral system is a writing system for expressing numbers, which is a mathematical notation for representing numbers of a given set, using graphemes or symbols in a consistent manner. Numeral most commonly can be seen as the context that allows the numerals "11" to be interpreted as the binary symbol for 3, the decimal symbol for eleven, or a symbol for other numbers in different bases.
Decimal numeral system is the mostly common used numeral system.