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MMMM with an horizontal bar above each numeral to denote multiplication by a thousand, because M = 1000 but M with an horizontal bar above it denotes 1000 x 1000 = 1000000. Brackets can also be used to indicate that a numeral should me mulitplied by 1000, so (MMMM) means 4000 x 1000 which is 4,000,000.

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15y ago

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