The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+0491 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:
Ge or G (Ґ ґ; italics: Ґґ) is a letter of the Cyrillic script. It is part of the Ukrainian alphabet, the Pannonian Rusyn alphabet and both the Carpathian Rusyn alphabets, and also some variants of the Urum and Belarusian (i.e. Belarusian Classical Orthography) alphabets. In these languages it is usually called ge, while the letter it follows, ⟨Г г⟩ is called he.
The letterform of this letter is based on the letterform of the letter ⟨Г г⟩, but its handwritten and italic lowercase forms do not follow the italic modification of ⟨г⟩: г.
It represents the voiced velar plosive /ɡ/, like the pronunciation of ⟨g⟩ in "go".
The letter ⟨ґ⟩ is usually romanized using the Latin letter g, or sometimes ġ with a dot or g̀ with a grave accent.
In the Unicode system for text encoding, the characters representing this letter are called CYRILLIC CAPITAL LETTER GHE WITH UPTURN (code point U+0490) and CYRILLIC SMALL LETTER GHE WITH UPTURN (U+0491), while the unmodified characters representing the letter ⟨г⟩ are called CYRILLIC CAPITAL and SMALL LETTER GHE (U+0413 and U+0433).