Х/х

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.