The Roman numeral equivalent of the number two is II. The Roman numeral system uses letters and combinations of letters to represent numbers. Since the Roman numeral for one is "I," the number two is written "II."
The number three is written as "III." An individual numeral may only appear three times in succession within a Roman numeral; as a result, the number four is written as five minus one, or "IV," with V being the Roman numeral for five. When a letter representing a smaller number comes before the letter representing a larger one, the smaller one is subtracted from the larger. The number six is written as five plus one, or "VI." When a letter representing a smaller number follows a letter representing a larger number, the two are added.