What is the meaning of ض?

Arabic letter ḍād

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

The fifteenth letter of the Arabic alphabet. It is preceded by ص () and followed by ط ().

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

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

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

The fifteenth letter of the Arabic alphabet. It is preceded by ص (ṣād) and followed by ط (ṭāʔ).

The twenty-eighth letter of the Khowar abjad.

The twentieth letter of the Xiao'erjing abjad

The twenty-sixth letter of the traditional alphabet chart of Kashmiri.

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

The twenty-fifth letter of the Pashto alphabet.

The eighteenth letter of the Perso-Arabic alphabet. It is preceded by ص and followed by ط. Its name is ضاد (zâd), In Dari it may also go by the names ضوات (zwât) and ضواد (zwâd, zwâd).

The twenty-first letter of Punjabi in the Shahmukhi script.

The thirty-second letter of the Sindhi abjad.

The twenty-first letter of the Urdu abjad.

Source: wiktionary.org