What is the meaning of ?

a voiceless retroflex sibilant fricative (IPA [ʂ]).

transliterates Sanskrit (or equivalent).

Romanization of the Hebrew ץ \ צ (tzadi”, “tsadi”, “ẕadi”, “ṣāḏē) in the ISO 259 transliteration scheme

A letter of the Kabyle alphabet, written in the Latin script.

The letter of the O'odham alphabet, written in the Latin script.

A letter of the Tuareg alphabet, written in the Latin script.

The twenty-first letter of the Yoruba alphabet, called ṣí and written in the Latin script.

Source: wiktionary.org