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The largest roman number is 'M' which stands for a thousand.

So 1,000,000,000 (one billion/milliard) would be written as a million M's.

In the Middle Ages a horizontal line above the roman numbers was used to multiply with thousand. So then you would only need a thousand M's with a line above them.

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11y ago
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Q: What is old roman symbol of 1000000000?
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