The basic set of symbols used in the Roman fashion of writing calendar dates
The set of symbols that were long used by the Romans to writing calendar dates:
- 1 = I (one)
- 5 = V (five)
- 10 = X (ten)
- 50 = L (fifty)
- 100 = C (one hundred)
- 500 = D (five hundred)
- 1000 = M (one thousand)
- 5000 = (V) (five thousand) - for future dates writing *
- 10,000 = (X) (ten thousand) - for future dates writing *
Note 1: * Number was also written with a bar above or between two vertical bars. We prefer this kind of writing of bigger numerals between brackets since it's more accessible to computer users and it also removes any ambiguity (so as to take a vertical bar | for an one I and vice versa).
Note 2: * Romans did not use right from the start numbers higher than 3999, so they were having no representation for numbers like 5,000, 10,000, 50,000, 100,000, 500,000, 1,000,000. These were later added and for them various different notations were used, not necessarily the ones above. Thus, initially, the maximum number that could be written with Roman numerals was: MMMCMXCIX = 3999.