The Roman numeral S (the Latin word for it is semis) is equivalent to a half in Arabic numeracy.
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On Converting between Arabic and Roman Numbers we get: xxxvmmxiii in roman numerals is written as :2038 where M=1000 X=10
They are both worked out in descending order of greatness and they both are increased by increments of 1's 10's 100's ... etc
The Roman numeral S is equivalent to 1/2
M = 1000, D = 500, C =100, L = 50, X = 10, V = 5 and I = 1 There is another Roman numeral that is hardly used and that is S which stands for 1/2.
In Roman numerals S = 1/2 or 0.5 and XS would mean 10.5