The voiced postalveolar or palato-alveolar fricative is a type of consonantal sound used in some spoken languages. The International Phonetic Association uses the term voiced postalveolar fricative only for the sound [ʒ],[1] but it also describes the voiced postalveolar non-sibilant fricative [ɹ̠˔], for which there are significant perceptual differences, as one is a sibilant and one is not.