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+043B forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 2 other glyphs.
The Wikipedia has the following information about this codepoint:
El (Л л or Ʌ ʌ; italics Л л or Л л or Ʌ ʌ; italics:ЛлorɅʌ) is a letter of the Cyrillic script.
El commonly represents the alveolar lateral approximant /l/. In Slavic languages it may be either palatalized or slightly velarized; see below.