How many units does the Roman numeral C represent?

The Roman numeral "C" represents 100 units. In the Roman numeral system, different letters are used to signify certain values: "I" is for 1, "V" is for 5, "X" is for 10, "L" is for 50, "C" is for 100, "D" is for 500, and "M" is for 1000. Therefore, when you see the letter "C" on its own, it directly translates to the number 100. Understanding Roman numerals is essential for interpreting various historical documents and contexts where these symbols are still used today.