U+06E0 ARABIC SMALL HIGH UPRIGHT RECTANGULAR ZERO

U+06E0 was added to Unicode in version 1.1 (1993). It belongs to the block Arabic in the Basic Multilingual Plane.

This character is a Nonspacing Mark and is mainly used in the Arabic script.

The glyph is not a composition. It has a Neutral East Asian Width. In bidirectional context it acts as Nonspacing Mark and is not mirrored. In text U+06E0 behaves as Combining Mark regarding line breaks. It has type Extend for sentence and Extend for word breaks. The Grapheme Cluster Break is Extend.

The Wikipedia has the following information about this codepoint:

Classical Arabic (CA), also known as Quranic Arabic, is the form of the Arabic language used in literary texts from Umayyad and Abbasid times (7th to 9th centuries). It is based on the medieval dialects of Arab tribes. Modern Standard Arabic (MSA) is the direct descendant used today throughout the Arab world in writing and in formal speaking, for example, prepared speeches, some radio broadcasts, and non-entertainment content. While the lexis and stylistics of Modern Standard Arabic are different from Classical Arabic, the morphology and syntax have remained basically unchanged (though MSA uses a subset of the syntactic structures available in CA). The vernacular dialects, however, have changed more dramatically. In the Arab world, little distinction is made between CA and MSA, and both are normally called al-fuṣḥá (الفصحى‎) in Arabic, meaning 'the most eloquent (Arabic language)'.

Because the Quran is written in Classical Arabic, the language is considered by most Muslims to be sacred.