As an expert in the field of ancient languages and numeral systems, I can tell you that Roman numerals are a numeral system that originated in ancient Rome and were used throughout the Roman Empire. The Roman numeral system is a mix of additive and subtractive principles, where letters represent certain values and are combined to represent larger numbers.
The Roman numeral
XC is a combination of two symbols:
X, which stands for 10, and
C, which stands for 100. However, when a smaller numeral appears before a larger one, the smaller numeral is subtracted from the larger one. Therefore,
XC represents 100 minus 10, which equals
90.
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