What does XIIX mean in Roman numerals?

Answer 1

In Roman numerals, XIIX is not a valid representation. The Roman numeral for 18 is XVIII, which is formed by combining the symbols for 10 (X), 5 (V), and 3 (III). The correct representation of 18 in Roman numerals follows the additive principle where smaller values are added to larger values to create the desired number.

Answer 2

In Hebrew the word 'chai' ('חי') means life.

In the Hebrew numeral system ח is 10 and י is 8. So חי is 18.

This means that in the Jewish faith, the number 18 is always linked with life.

In Roman times, Jewish people would inscribe XIIX in significant or religious places as a blessing. They would write in Roman numerals because Judaism was often outlawed and they had to hide it.

Below is Mark's explanation of the Roman numeral system:

I is equivalent to 1,

V is equivalent to 5,

X is equivalent to 10,

L is equivalent to 50,

let's stop at there.

I is one, II is two, III is three, IV is four, V is 5.

The reason IV would be four instead IIII being four it means 5 - 1. Similarly, IX is 9. However, VI and XI mean 6 and 11 respectively. if a smaller number comes before a bigger number, it is subtracted from the bigger number. Otherwise, the numbers are added. there may be XL to represent 40 but never XXL to represent thirty. similarly, you will never see IIV or IIX.

This is correct relating to modern use of Roman numerals. The antique Romans did occasionally use XIIX as 18. See the tombstone of Marcus Caelius. The second line of the inscription is "o Leg XIIX Ann LIII s", meaning "first order of the 18th legion in his 53rd and half year".