This character is a Other Letter and is mainly used in the Arabic script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written as Arabic letter from right to left. When changing direction it is not mirrored. The word that U+0632 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 12 other glyphs.
The Wikipedia has the following information about this codepoint:
Zayin (also spelled zain or zayn or simply zay) is the seventh letter of the Semitic abjads, including Phoenician zayn 𐤆, Hebrew zayīn ז, Aramaic zain 𐡆, Syriac zayn ܙ, and Arabic zāy ز. It represents the sound [z].
The Phoenician letter gave rise to the Greek zeta (Ζ), Etruscan z , Latin Z, and Cyrillic Ze З.