The IPA Unicode character No. 0x026E. Symbol of voiced alveolar lateral fricative.
In Wikipedia it may  be used to represent a ligature of l and ʒ, the IPA symbols for the first and last sounds in language, as a symbol for articles about languages.

11.5-pt Gentium Book Plus glyph on a 16×16-px canvas, vertically centered on ⟨ʃ⟩.
No machine-readable source provided. Own work assumed (based on copyright claims).
No machine-readable author provided. Martin Kozák assumed (based on copyright claims).