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The Roman numeral for a half looks like the letter S and its Latin name is semis meaning a half. So the Romans themselves would have probably wrote out 1999 as IMM and half of this would be SM (-1/2+1000 = 999 and a 1/2)

In accordance with the rules governing the Roman numeral system, which were introduced during the Middle Ages, 1999 today is written out as MCMXCIX and halving this could possibly be CMXCIXS.

But the former method of halving 1999 is more convincing than the latter.

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14y ago

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