Okay, the user wants me to translate "roman numeral" into Simplified Chinese. Let me check if it's already in Simplified Chinese. The term "roman numeral" is a Latin term, so in Chinese, it's commonly translated as "罗马数字". I need to confirm if there's any other possible translation, but I think "罗马数字" is the standard one. Since the user specified to output only the translation without explanations, I'll just provide that.