What do we call the symbols in old Roman notation that represent numbers?

The symbols in old Roman notation that represent numbers are known as Roman numerals. This numeral system originated in ancient Rome and uses combinations of letters from the Latin alphabet—specifically I, V, X, L, C, D, and M—to denote values. For instance, the letter "I" represents 1, "V" represents 5, "X" represents 10, and so on, with larger numbers represented by combining these symbols.

Understanding Roman numerals is important for interpreting historical dates, clock faces, and various forms of art and literature, as they continue to appear in modern contexts. The other options refer to different numeral systems or symbols: Arabic numerals are the ten digits (0-9) we use in most of the world today, the decimal system pertains to base-10 mathematics, and algebraic symbols represent variables and constants used in algebra. Roman numerals are distinct and specifically tied to the ancient Roman culture.