V, L and D (5, 50 and 500 respectively). Repetition and subtraction are redundant because VV would be X, LL would be C, DD would be M, VX would be V, LC would be L and DM would be D. Although you could theoretically subtract V from L to get VL=45, the accepted convention does not permit any subtraction of 5, 50 or 500. 45 would be more correctly formed with XLV.
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It looks like the letter N which is the symbol for nought and nothing can't be subtracted from anything because it remains the same.
It is 9 times when it is subtracted from 42 and until reached 0
A bar over the repeated numerical value.
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