DCCCXC is a Roman numeral that represents the number 890. In this numeral, "D" stands for 500, "CCC" represents 300 (100 each), and "XC" signifies 90 (100 minus 10). Roman numerals are a numeral system originating from ancient Rome, using combinations of letters from the Latin alphabet. This numeral system is still used today in various contexts, such as clock faces, book chapters, and movie titles. Understanding Roman numerals can be helpful in interpreting historical texts and artifacts, as well as in recognizing their influence on modern numbering systems.