Holding down the Shift key while typing the matching lowercase Roman numeral on a conventional keyboard produces Roman numerals. Instead of pressing the Shift key, the Caps Lock button can be used. An illustration of how to type a Roman numeral on a keyboard is to type the lowercase letter “m” while pressing the Shift key to create the Roman numeral “M.”
Seven symbols serve as the foundation for Roman numerals: I, V, X, L, C, D, and M. These symbols each represent a certain numerical value. The numbers 1, 5, 10, 50, 100, 500, and 1,000 are represented by the letters I, V, X, L, C, D, and M, respectively. All additional values in the numeric system are created using a combination of these fundamental symbols.
Combining symbols yields their value through addition. For instance, III is made up of three ones, which equals three, and XIII is made up of a ten and three ones, which equals thirteen. The Roman numeral system does not have a symbol for zero. For instance, the symbol for 208 is CCVIII, which stands for two 100s, a five, and three ones.
Beginning with the largest, symbols are arranged from left to right in order of value. However, these can be decreased using subtractive notation in a few limited circumstances to prevent four characters from being repeated in a row.