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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 and in the current Alaska Native Language Center alphabet of the Haida language. 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.

References

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.
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.

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