How would 23 be written in a simple grouping system using Roman numeral symbols?

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Two vertical tablets display ancient symbols for the numbers one and ten from Egyptian hieroglyphic, Egyptian hieratic, Sumerian, and Cretan scripts, with each symbol shown in red next to its culture and approximate date. — numerals and numeral systems Examples of ancient symbols for the numbers 1 and 10.

In a simple grouping system using Roman numerals, the number 23 is written as XXIII.12

This representation follows the additive principle of the system, where the value is determined by summing the individual symbols: X (10) + X (10) + I (1) + I (1) + I (1) = 23.12