The roman numeral for one is I.
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The roman numeral for one half is S.
The Roman Numeral is one (I) - Copper(I) Sulfate.
I:V::IV:___ I:Ix5:IV:____ I:V::IV:XX
The Roman Numeral M is equal to 1000 One Thousand
If you think to 1 (one) the Roman numeral is I.