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The Arabic numerals where the ten digits (0,1,2,3,4,5,6,7,8,9) of the numeral system used by most of humanity in the time of the Terran Federation.

It was abolished by the Operation Ark command crew along with the metric system when they created the society of the planet Safehold, likely to make the reemergence of complex mathematics more difficult. As a result, Safeholdians wrote numbers in the Roman numeral system.

The reintroduction of Arabic numerals was among Merlin Athrawes' first changes to Charisian society. (OAR)

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