CXXX is a Roman numeral that represents the number 130. 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, and "XXX" represents 30, making the total 130. This numeral can be found in various contexts, such as in the naming of events, chapters in books, or even in the designation of years. For example, the year 130 AD is often referred to as CXXX in Roman numeral notation, highlighting its historical significance.