What is the meaning of ڑ?

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

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

The nineteenth letter of the Khowar alphabet, written in the Arabic script; preceded by ر and followed by ز.

The nineteenth letter of the Kashmiri alphabet, written in the Arabic script; preceded by ر and followed by ز.

The fifteenth letter of the Punjabi alphabet, written in the Shahmukhi script; preceded by ر (re) and followed by ز (ze).

The fifteenth letter of the Urdu alphabet, written in the Arabic script; preceded by ر and followed by ز.

Source: wiktionary.org