Quote:
MCCCC is not a valid Roman numeral:
Why is the Roman numeral not valid? The letter C ( = 100) cannot repeat itself more than 3 times in a row.
For Roman numerals, you wouldn't repeat the C four times,
if you're using traditional subtractive notation. You
might, if you're using the less common additive notation.
One public example is the inscription on London's Admiralty Arch:
ANNO DECIMO EDWARDI SEPTIMI REGIS / VICTORIĘ REGINĘ CIVES GRATISSIMI MDCCCCXMDCCCCX in this case representing 1910, the tenth year of Edward VII's reign.
I'm not using the clock-face example (IIII) because there are other theories out there on that one.
Common or not, if it's what the cancel creators did, and I'm not saying it is, then it would be out there in the wild.
My
2d. IId.
ETA a quote, so it is clear to whom I am replying.