Velarised alveolar lateral approximant
This is commonly known as a dark l to distinguish it from light l.
The IPA phonetic symbol [ɫ] represents a velarised alveolar lateral approximant, like deal /diːl/ [diːɫ] or scale /skeɪl/ [skeɪɫ].
In natural speech, /l/ at the end of a syllable or before a consonant may be velarised. Some pronunciation coaches call it "dark L". When a native speaker makes a "dark L", the back of the tongue is raised towards the soft palate.
This sound is also present in Polish mały [ˈmaɫi] (some accents), and it is slightly different from the one in mali [ˈmali].
Unicode and HTML
Unicode: U+026B Latin small letter L with middle tilde
- Encyclopaedia Britannica, Velarization.