It is 10000, exactly as in the question!
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10000 in Roman numerals would be (X)
10000 in Roman numerals is simply X but with an horizontal bar above the numeral to signify multiplication by a thousand (10*1000 = 10000)
You'll find the possible answer in the question: What are the numbers from 1 to a 1000000 in Roman numerals?
(X) or X with a line above it
The number 10,000 can be written in Roman numerals as [X] or as X with a horizontal bar placed above it (which I can't write with this keyboard).