CCCXL is a Roman numeral that represents the number 340. In this numeral system, "C" stands for 100, and "X" stands for 10. Therefore, CCCXL can be broken down into three "C"s (300) and one "XL" (40), which together total 340. Roman numerals are often used in various contexts, such as in the naming of monarchs and popes, or to denote the year of publication in books. Understanding Roman numerals, including CCCXL, can be helpful in reading historical texts or interpreting dates in classical literature.