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"Х/х" is a letter in the Cyrillic alphabet that represents a guttural sound similar to the "kh" in the English word "Bach." It is one of the basic letters used in writing Russian and several other Slavic languages.
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Kha, from Elisabeth Boehm's alphabet book
Kha, Khe, Xe, He or Ha (Х х; italics: Х х or Х х; italics: Х х) is a letter of the Cyrillic script. It looks the same as the Latin letter X (X x X x), in both uppercase and lowercase, both roman and italic forms, and was derived from the Greek letter Chi, which also bears a resemblance to both the Latin X and Kha itself.