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{{Wiktionary|nine}}{{Expand English}}[[File:En-us-Nine.ogg|thumb|right|Pronunciation of the number 9]]
{{Wiktionary|nine}}{{Expand English}}[[File:En-us-Nine.ogg|thumb|right|Pronunciation of the number 9]]
'''9''' ('''nine''') is the Arabic [[number]] which comes after [[8 (number)|8]] and before [[10 (number)|10]]. 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'''.
'''9''' ('''nine''') is the Arabic [[number]] which comes after [[8 (number)|8]], before [[10 (number)|10]], and two before [[11 (number)|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.
The number also looks like an inverted ''6''. To tell the difference between the two, they are often underlined.
File:Yang Hui magic circle.svg|Four concentric [[Magic circle (mathematics)|magic circle]]s with '''9''' in the center (by [[Yang Hui]]), where numbers on each circle and [[diameter]] around the center generate a [[magic constant|magic sum]] of [[138 (number)|138]].
File:Yang Hui magic circle.svg|Four concentric [[Magic circle (mathematics)|magic circle]]s with '''9''' in the center (by [[Yang Hui]]), where numbers on each circle and [[diameter]] around the center generate a [[magic constant|magic sum]] of [[138 (number)|138]].
File:9dots.svg|The "nine dots" puzzle. The puzzle asks to link all nine dots using four straight lines or fewer, without lifting the pen.
File:ICS Niner.svg|[[International maritime signal flag]] for 9
File:ICS Niner.svg|[[International maritime signal flag]] for 9