Original meaning: 123 (one hundred and twenty-three), a natural number between 122 and 124, factorized into a composite number (with conventions 1, 3, 41, 123). 123, in music, stands for Do, Re, and Mi in a simple score.

The ten numerals of the Indian-Arabic numeral system, arranged by value. A numeral is a written symbol used to represent a number. Different systems of notation can use the same numbers, for example, the numbers "0" and "1" are used in both decimal and binary.

The same number in different notation systems have different representations, for example, the number 37 (Arabic numerals decimal) can be written in a variety of ways: Chinese numerals written in thirty-seven Roman numerals written in XXXVII Arabic numerals written in binary 100101.

Numbers are closely related to our lives. It not only has the function of counting, but also has a rich philosophical connotation. Humans and numbers have been closely linked from the beginning and will be linked forever.

The numbers are called Arabic numerals, causing this historical misunderstanding. Later, as it spread around the world, the term "Arabic numerals" came to be recognized, leading people in many parts of the world to believe that the Arabs invented them, when in fact it was the Arabs who first began to use them widely.