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Roman numerals are used in Europe before the introduction of Arabic numerals (actually Indian numerals), but they are rarely used now. It came into being later than the numbers in China and Oracle Bone Inscriptions, and even later than the Egyptian decimal numbers. However, its appearance marks the progress of an ancient civilization.

Multi-livestock grazing together

The most common Roman numerals are the dial symbols of clocks and watches: I, II, III, IV (iiii), V, VI, VII, VIII, IX, IX, VII, ...

Periodic table of elements: family IA, family IIA, family IIIA, family IVA, family VA, family VIA, family VIIA, family IB, family IIB, family IIIB, family IVB, family VB, family VIB, family VIIB and family VIII.

The corresponding Arabic numerals (that is, the internationally used numerals now) are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,1,12 ... (Note: Arabia. )

References:

Roman numerals-Baidu encyclopedia