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X̂ is the Latin letter X with a circumflex. The letter is used in the modern orthography of the Aleut language^[1] and in the current Alaska Native Language Center alphabet of the Haida language.^[2] In both cases, it represents the sound [χ].

In mathematics, x̂ often refers to the unit vector in the +X direction. In statistics, it can also represent the predicted value for x, consistent with the hat notation.^[3]

Character information
Preview	X		x		̂
Unicode name	LATIN CAPITAL LETTER X		LATIN SMALL LETTER X		COMBINING CIRCUMFLEX
Encodings	decimal	hex	dec	hex	dec	hex
Unicode	88	U+0058	120	U+0078	770	U+0302
UTF-8	88	58	120	78	204 130	CC 82
Numeric character reference	X	X	x	x	̂	̂

References

^ Bergsland, Knut (1994). Aleut Dictionary = Unangam Tunudgusii: an |D with hook and tail|ᶑ lexicon of the Aleutian, Pribilof, and Commander Islands Aleut language. Fairbanks, AK: Alaska Native Language Center, University of Alaska. ISBN 978-1-55500-047-9.
^ Lachler, Jordan. "Ways of Writing Haida". Retrieved 25 November 2012.
^ Bailey, Michael (2021). Real Stats: Using Econometrics for Political Science and Public Policy. pp. 310–311. ISBN 978-0-19-085949-7.

[1] Bergsland, Knut (1994). Aleut Dictionary = Unangam Tunudgusii: an |D with hook and tail|ᶑ lexicon of the Aleutian, Pribilof, and Commander Islands Aleut language. Fairbanks, AK: Alaska Native Language Center, University of Alaska. ISBN 978-1-55500-047-9.

[wwh-2] Lachler, Jordan. "Ways of Writing Haida". Retrieved 25 November 2012.

[3] Bailey, Michael (2021). Real Stats: Using Econometrics for Political Science and Public Policy. pp. 310–311. ISBN 978-0-19-085949-7.

[1]

[2]

[3]

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References

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