An M with 3 horizontal lines above it (for a US trillion = 10^12)
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The roman numeral for one is I.
Present usage has trillion indicated by T (Tera) so it looks like a Roman numeral. Though this is only a modernization, as traditional Roman numerals only went up to a million, indicated with M with a bar over the top.
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