The retroflex approximant is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ɻ ⟩, and the equivalent X-SAMPA symbol is r\`. The IPA symbol is a turned lowercase letter r with a rightward hook protruding from the lower right of the letter.
Read more about Retroflex Approximant: Features, Occurrence