Retroflex consonants are articulated with the tip of the tongue curled up and back so the bottom of the tip touches the roof of the mouth. Retroflex consonants identified by the International Phonetic Alphabet:
Note: In the International Phonetic Alphabet, the symbols for retroflex consonants are typically the same as for the alveolar consonants, but with the addition of a right-facing hook to the bottom of the symbol.
The tongue may be flat, with the blade of the tongue (the top surface of the tongue near the tip) touching the roof of the mouth, as in Polish cz, sz, ż and Mandarin ch, zh, sh.
The retroflex lateral approximant is a type of consonantal sound used in some spoken languages, such as Tamil and Malayalam.
Its manner of articulation is approximant, which means it is produced by bringing one articulator close to another but without the vocal tract being narrowed to such an extent that a turbulent airstream is produced.
Its place of articulation is retroflex, which prototypically means it is articulated with the tip of the tongue curled up, but more generally means that it is postalveolar without being palatalized.