CCXXI is the Roman numeral representation for the number 221. Roman numerals are a numeral system originating from ancient Rome, using combinations of letters from the Latin alphabet. In this system, "C" stands for 100, "X" for 10, and "I" for 1. Therefore, CCXXI can be broken down as 200 (CC) + 20 (XX) + 1 (I). This numeral system is still used today in various contexts, such as in clock faces, book chapters, and movie titles. Understanding Roman numerals can enhance one's appreciation of history and culture, as they are often found in historical documents, architecture, and art.