Because in ancient Rome I) meant 1*500 = 500 and (I) meant 1*1000 = 1000 and over time they became D and M respectively
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The letter "D" represents the number 500 in Roman numerals.
The 7 main Roman numerals are: M D C L X V and I
"D" in Roman Numerals equals 500.
The number 500 is represented by the Roman numeral D
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