What is the meaning of ث?

Arabic letter ṯāʾ

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

The fourth letter of the Arabic alphabet, called ثَاء (ṯāʔ) and written in the Arabic script; preceded by ت (t) and followed by ج (j).

The twenty-third numeral symbol of the Arabic alphabet (traditional abjad order, used for list numbering), written in the Arabic script; preceded by ت (t) and followed by خ (ḵ).

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

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

The fourth letter of the Hijazi Arabic alphabet, written in the Arabic script; preceded by ت (tāʔ) and followed by ج (jīm).

The sixth letter of the Khowar alphabet, written in the Arabic script; preceded by ٹ and followed by ج.

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

The sixth letter of the Pahari-Potwari alphabet, written in the Shahmukhi script; preceded by ٹ (ṭe) and followed by ج (jīm).

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

The ninth letter of the Kashmiri alphabet, written in the Arabic script; preceded by ٹھ and followed by ج.

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

The sixth letter of the Pashto alphabet, written in the Arabic script; preceded by ټ and followed by ج.

The fifth letter of the Persian alphabet, called ثه or ثِ and written in the Arabic script; preceded by ت and followed by ج.

The sixth letter of the Punjabi alphabet, written in the Shahmukhi script; preceded by ٹ (ṭe) and followed by ج (jīm).

The ninth letter of the Sindhi alphabet, written in the Arabic script; preceded by ٺ and followed by پ.

The fourth letter of the Urdu alphabet, written in the Arabic script; preceded by ٹ and followed by ج.

Source: wiktionary.org