What is the meaning of ص?

Arabic letter ṣād

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

The fourteenth letter of the Arabic alphabet, written in the Arabic script; preceded by ش (š) and followed by ض (ḍ).

Y, unknown variable.

a.m., before noon (abbreviation of صباحًا)

The eighteenth numeral symbol of the Arabic alphabet (traditional abjad order, used for list numbering), written in the Arabic script; preceded by ف (f) and followed by ق (q).

The 38th sura (chapter) of the Qur'an.

The twenty-seventh letter of the Balti alphabet, written in the Arabic script.

The twenty-sixth letter of the Burushaski alphabet, written in the Arabic script.

The twenty-seventh letter of the Khowar alphabet, written in the Arabic script; preceded by ښ and followed by ض.

A letter of the Old Ruthenian alphabet, written in the Arabic script.

The nineteenth letter of the Xiao'erjing abjad, written in the Arabic script.

The twenty-fifth letter of the Kashmiri alphabet, written in the Arabic script; preceded by ش and followed by ض (z).

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

The twenty-fourth letter of the Pashto alphabet, written in the Arabic script; preceded by ښ and followed by ض.

The seventeenth letter of the Persian alphabet, called صاد or صواد and written in the Arabic script; preceded by ش and followed by ض.

The twentieth letter of the Punjabi alphabet, written in the Shahmukhi script; preceded by ش (šīn) and followed by ض (ẓwāt).

The thirty-first letter of the Sindhi alphabet, written in the Arabic script; preceded by ش and followed by ض.

The twentieth letter of the Urdu alphabet, written in the Arabic script; preceded by ش and followed by ض.

Source: wiktionary.org