What is the meaning of خ?

The seventh letter of the Arabic alphabet. Its name is خَاء (ḵāʔ), and is preceded by ح () and followed by د (d).

The twenty-fourth letter in traditional abjad order, which is used in place of numerals for list numbering (abjad numerals). It is preceded by ث () and followed by ذ ().

The twelfth letter of the Balti alphabet, written in the Perso-Arabic script

The fourteenth letter of the Burushaski alphabet, written in the Perso-Arabic script

The seventh letter of the Arabic alphabet. Its name is خَاء (ḵāʔ), and is preceded by ح (ḥāʔ) and followed by د (dāl).

The tenth letter of the Khowar abjad.

The tenth letter of the Xiao'erjing abjad.

The fourteenth letter of the traditional alphabet chart of Kashmiri.

The eighth letter of the Malay alphabet, written in the Arabic script.

The twelfth letter of the Pashto alphabet.

The ninth letter of the Perso-Arabic alphabet. It is preceded by ح and followed by د.

The tenth letter of Punjabi in the Shahmukhi script.

The eighteenth letter of the Sindhi abjad.

The tenth letter of the Urdu abjad.

The eighth letter of the Uyghur alphabet.

Source: wiktionary.org