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9th

← 8 9 10 →
−1 0 1 2 3 4 5 6 7 8 9
Cardinal nine
Ordinal 9th
(ninth)
Numeral system nonary
Factorization 32
Roman numeral IX
Unicode symbol(s) Ⅸ, ⅸ
Greek prefix
Latin prefix
Binary 10012
Ternary 1003
Quaternary 214
Quinary 145
Senary 136
Octal 118
Duodecimal 912
Hexadecimal 916
Vigesimal 920
Base 36 936
Amharic
Arabicl & Kurdish ٩
Urdu ۹
Armenian numeral Թ
Bengali
Chinese/Japanese
/Korean numeral
九 (jiu)
玖 (formal writing)
Devanāgarī (nau)
Greek numeral θ´
Hebrew numeral ט (Tet)
Tamil numerals
Khmer
Telugu numeral
Thai numeral

9 (nine /ˈnn/) is the natural number following 8 and preceding 10.

Nine is a number that appears often in Indian Culture and mythology. Some instances are enumerated below.

According to Georges Ifrah, the origin of the 9 integers can be attributed to the ancient Indian civilization, and was adopted by subsequent civilizations in conjunction with the 0.

In the beginning, various Indians wrote 9 similar to the modern closing question mark without the bottom dot. The Kshatrapa, Andhra and Gupta started curving the bottom vertical line coming up with a 3-look-alike. The Nagari continued the bottom stroke to make a circle and enclose the 3-look-alike, in much the same way that the @ character encircles a lowercase a. As time went on, the enclosing circle became bigger and its line continued beyond the circle downwards, as the 3-look-alike became smaller. Soon, all that was left of the 3-look-alike was a squiggle. The Arabs simply connected that squiggle to the downward stroke at the middle and subsequent European change was purely cosmetic.

While the shape of the 9 character has an ascender in most modern typefaces, in typefaces with text figures the character usually has a descender, as, for example, in TextFigs196.png.

This numeral resembles an inverted 6. To disambiguate the two on objects and documents that can be inverted, the 9 is often underlined, as is done for the 6. Another distinction from the 6 is that it is sometimes handwritten with a straight stem, resembling a raised lower-case letter q.

Nine is a composite number, its proper divisors being 1 and 3. It is 3 times 3 and hence the third square number. Nine is a Motzkin number. It is the first composite lucky number, along with the first composite odd number.


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Wikipedia

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