Roman numerals are an ancient number in Europe. Since the world's famous watches are mostly from Europe (Switzerland, Germany), the use of Roman numerals is very solemn and elegant, and it also represents tradition.
Almost every human text has its own digital expression, but the Arabic numerals are universal and easy to remember because of their beautiful appearance. Interestingly, however, when you really go to an Arabic-speaking country, you will find that the Arabic numerals used in Arabic-speaking countries are very different from the global Arabic-language writing.

Furthermore, Roman numerals are frequently used in official European events, especially in places of worship, which symbolize certain gods. The Roman numerals on the clocks are only 1-12, that is: I, II, III, IV (or IIII), V, VI, VII, VIII, IX, X, XI, XII, following the "left minus right plus" The general principle is relatively easy to remember. Roman numerals have no zero representation and cannot be written in lowercase letters. Use Roman numerals to indicate the year comparison tester. For example, 1949 should be written as: MCMXLIX, 1978 should be written as: MCMLXXVIII, 1735 should be written as: MDCCXXXV, 2017 should be written as: MMXVII... It is much more complicated than Arabic numerals.