The glyph is not a composition. Its width in East Asian texts is determined by its context. It can be displayed wide or narrow. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+0436 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
Zhe, sometimes transliterated as Že (Ж ж; italics: Жж) is a letter of the Cyrillic script. It commonly represents the voiced retroflex sibilant /ʐ/ (listen) or voiced alveolar fricative /ʒ/. It is also often used with D (Д) to approximate the sound in English of the Latin letter J with a ДЖ combination. Zhe is romanized as ⟨zh⟩, ⟨j⟩ or ⟨ž⟩.