The letter "خ" is the 22nd letter of the Arabic alphabet. It is pronounced as a voiceless velar fricative, similar to the "ch" in the Scottish word "loch." In Arabic script, "خ" has a unique shape and can change form depending on its position in a word: initial, medial, or final. In terms of numerical value, "خ" represents the number 600 in the Arabic numeral system. It is commonly used in various Arabic words, including خُبز (bread) and خَير (goodness). Understanding "خ" is essential for reading and writing in Arabic.