AI overview
Chi (Χ/χ) is a letter from the ancient Greek alphabet that represents a hard "kh" sound, similar to the "ch" in the German word "Bach." It appears in English primarily through Greek-derived words and scientific terminology, and is also used as a symbol in mathematics and other fields.
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Article · 日本語
Χ, χ（カイ、キー、ヒー、古代ギリシア語: χεῖ ケー、ギリシア語: χι ヒ、英語: chi, khi [ˈkaɪ] カイ）は、ギリシア文字の第22字。数価は600。 ラテン文字のX、キリル文字のХはこの文字に由来する。
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