9 (number)

← 8 9 10 →
-1 0 1 2 3 4 5 6 7 8 9 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	nine
Ordinal	9th (ninth)
Numeral system	nonary
Factorization	32
Greek numeral	Θ´
Roman numeral	IX
Unicode symbol(s)	Ⅸ, ⅸ
Greek prefix	ennea-
Latin prefix	nona-
Binary	10012
Ternary	1003
Quaternary	214
Quinary	145
Senary	136
Octal	118
Duodecimal	912
Hexadecimal	916
Vigesimal	920
Base 36	936
Amharic	፱
Arabicl	٩
Urdu
Armenian numeral	Թ
Bengali	৯
Chinese/Japanese /Korean numeral	九 (jiu) 玖 (formal writing)
Devanāgarī	९ (Nao)
Greek numeral	θ´
Hebrew numeral	ט (Tet)
Tamil numeral	௯
Khmer	៩
Telugu numeral	౯
Thai numeral	๙

The Simple English Wiktionary has a definition for: nine.

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9 (nine) is the Arabic number which comes after 8, before 10, and two before eleven. It is an odd number, and is the highest single-digit number. It is also a square number. In Roman numerals, nine can be written as IX.

The number also looks like an inverted 6. To tell the difference between the two, they are often underlined. Some people also write the number 9 like a lowercase letter "q" to make it different from the 6.

Mathematics

The number nine (9) takes the shape of an upside-down six (6), is a multiple of 3, and the third square number after 4.

Nine is also a composite number, having the factors: 1, 3 and 9 itself. Nine is the first odd composite number

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