What is the meaning of ظ?

The eighteenth letter of the Acehnese alphabet, written in the Arabic script.

The seventeenth letter of the Arabic alphabet, written in the Arabic script; preceded by ط (ṭ) and followed by ع (ʕ).

The twenty-seventh numeral symbol of the Arabic alphabet (traditional abjad order, used for list numbering), written in the Arabic script; preceded by ض (ḍ) and followed by غ (ḡ).

The thirtieth letter of the Balti alphabet, written in the Arabic script.

The thirtieth letter of the Burushaski alphabet, written in the Arabic script.

The seventeenth letter of the Hijazi Arabic alphabet, written in the Arabic script; preceded by ط (ṭāʔ) and followed by ع (ʕēn).

The thirtieth letter of the Khowar alphabet, written in the Arabic script; preceded by ط and followed by ع.

The twenty-third letter of the Xiao'erjing abjad, written in the Arabic script.

The twenty-eighth letter of the Kashmiri alphabet, written in the Arabic script; preceded by ط (t) and followed by ع.

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

The twenty-seventh letter of the Pashto alphabet, written in the Arabic script; preceded by ط and followed by ع.

The twentieth letter of the Persian alphabet, called ظا and written in the Arabic script; preceded by ط and followed by ع.

The twenty-third letter of the Punjabi alphabet, written in the Shahmukhi script; preceded by ط (t̤ōē) and followed by ع ('en).

The thirty-fourth letter of the Sindhi alphabet, written in the Arabic script; preceded by ط and followed by ع.

The twenty-third letter of the Urdu alphabet, written in the Arabic script; preceded by ط and followed by ع.

Source: wiktionary.org