What is the meaning of ر?

The tenth letter of the Arabic alphabet. Its name is رَاء (rāʔ) and is preceded by ذ () and followed by ز (z).

The twentieth letter in traditional abjad order, which is used in place of numerals for list numbering (abjad numerals). It is preceded by ق (q) and followed by ش (š).

second-person masculine singular imperative of رَأَى (raʔā)

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

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

The tenth letter of the Arabic alphabet. Its name is رَاء (rāʔ), and is preceded by ذ (ḏāl) and followed by ز (zāy).

The eighteenth letter of the Khowar abjad.

The thirteenth letter of the Xiao'erjing abjad.

The eighteenth letter of the traditional alphabet chart of Kashmiri.

The ninth letter of the Kazakh in Arabic Script. It represents the Cyrillic letter Р.

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

The sixteenth letter of the Pashto alphabet.

The twelfth letter of the Perso-Arabic alphabet. It is preceded by ذ and followed by ز. Its name is ره or رِ.

D, Re (the second note of the fixed-Do solfège scale)

Re (the second note of the movable-Do solfège scale, i.e. the supertonic)

The fourteenth letter of Punjabi in the Shahmukhi script.

The twenty-fifth letter of the Sindhi abjad.

The fourteenth letter of the Urdu abjad.

The tenth letter of the Uyghur alphabet.

The nineteenth letter of the Yoruba alphabet in the ajami script, equivalent to Latin script r.

Source: wiktionary.org