The 'Number Nine (9)' Chronicle

Facts about the number '9':

In Math,

It is the first composite lucky number.
Nine is the highest single-digit number in the decimal system.
a Motzkin number.
the second non-unitary square prime (3²)
A polygon with nine sides is called an enneagon (technically) or nonagon (in common usage).
binary complement of number six
The Enneagram is one system of knowledge which shows the correspondence between the 9 integers and the circle.

In Science,

Nine is the atomic number of fluorine.
Before 2006 (when Pluto was officially designated as a non-planet), there were nine planets in the solar system.
In Physiology, a human pregnancy normally lasts nine months.

In Religion,

Important Buddhist rituals usually involve nine monks.
The first nine days of the Hebrew month of Av are collectively known as "The Nine Days" (Tisha HaYamim), and are a period of semi-mourning leading up to Tisha B'Av, the ninth day of Av on which both Temples in Jerusalem were destroyed.
Nine is a significant number in Norse Mythology. Odin hung himself on an ash tree for nine days to learn the runes.
Jesus healed ten lepers; nine did not even thank Him.

In Chinese culture,

Nine (九 pinyin jiǔ) is considered a good number in Chinese culture because it sounds the same as the word "longlasting" (久 pinyin jiǔ).
Nine is strongly associated with the Chinese dragon, a symbol of magic and power. There are nine forms of the dragon, it is described in terms of nine attributes, and it has nine children It has 9×13 scales, 9×9 being yang (masculine, or bad influence) and 9×4 being yin (feminine, or good influence).
The dragon often symbolizes the Emperor, and the number nine can be found in many ornaments in the Forbidden City. The circular altar platform (Earthly Mount) of the Temple of Heaven has one circular marble plate in the center, surrounded by a ring of nine plates, then by a ring of 18 plates, and so on, for a total of nine rings, with the outermost having 81=9×9 plates.

In Music,

In music theory a ninth is the ninth note of a musical scale or the interval between the first note and the ninth. A ninth chord is a chord with a ninth.
Bands with the number nine in their name include Nine, Stroke 9, Nine Days, Nine Inch Nails and Alice Nine.
The Beatles released a song called "Revolution 9" which appears on The White Album (more properly known as The Beatles); its principal vocal feature is a voice repeating, "Number nine...number nine...number nine..." John Lennon, the primary composer of "Revolution 9", also released a solo recording entitled "#9 Dream".

In Sport,

Nine ball is the standard professional pocket billiards variant played in the United States.
In baseball, nine represents the right fielder's position.
Famed football(soccer) player Ronaldo (Brazilian men's national team) wears #9.
The number worn by NBA player Tony Parker of the San Antonio Spurs, MVP of the 2007 NBA Finals.

In other fields,

Nine judges sit on the United States Supreme Court.
The word "K-9" pronounces the same as canine and is used in many U.S. police departments to denote the unit working with police dog.
In the NATO phonetic alphabet, the digit 9 is called "Novenine".
Channel 9, an Australian free-to-air television station
The name of the area called Kowloon in Hong Kong literally means: nine dragons.

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