CDXLIII is the Roman numeral representation of the number 443. In the Roman numeral system, letters are used to signify values: C stands for 100, D for 500, L for 50, and I for 1. To break it down, CD represents 400 (500 - 100), XL represents 40 (50 - 10), and III represents 3. When combined, these values total 443. Roman numerals, including CDXLIII, were widely used in ancient Rome for various purposes, such as numbering chapters, clock faces, and dates. This numeral system is still used today in specific contexts, like the naming of monarchs and popes, as well as in the titles of movies and events.