The Roman numeral for the number 50 is "L." Roman numerals are a numeral system originating in ancient Rome, employing combinations of letters from the Latin alphabet to represent numbers. In this system, "L" specifically signifies the value of fifty, which is derived from the Latin word for fifty, "quinquaginta." Roman numerals are still used today in various contexts, such as on clock faces, in the titles of monarchs and popes, or to denote the chapters in books. Understanding Roman numerals can be useful in interpreting historical texts and modern citations.