The definition of 10 is a cardinal number that comes after nine and before eleven. It is an even number, with the opposite odd number being nine. In mathematics, ten is considered a composite or perfect square because it can be expressed as the sum of two squares: 3² + 1² = 10. Ten also has several other mathematical properties, such as divisibility by one, two, five, and ten; its prime factorization consists only of itself; its decimal representation never ends nor repeats; and its digital root (the sum of all digits) equals one when written in base-10 notation.
In some cultures around the world, particularly in East Asia where many people still use traditional counting systems like Chinese numerals or Japanese kanji characters for numbers instead of Arabic numerals used widely today elsewhere on Earth (e.g., 0-9), “ten” may not necessarily refer to what we know as “10” but rather something else altogether depending on which system they are using at any given time—for example, 十/千(Chinese/Japanese); สิบ(Thai); दश / हजार (Hindi). Similarly, different words may exist for larger multiples, such as twenty (=2 x 10).
Ten carries great significance across various fields, including religion – e.g., Ten Commandments from Christianity & Judaism – science – e..g., The Periodic Table contains 118 elements arranged into groups numbered 1 through 18 – history – e..g., The Bill Of Rights was ratified December 15th, 1791 consisting originally 12 amendments out which only first ten were adopted. Thus “ten” serves both practical purposes while simultaneously holding symbolic meaning, making it unique among all other numbers!