In Hanyu Pinyin, represents the voiceless retroflex affricate . Hindko contrasts stop consonants at the labial, alveolar, retroflex, palatal and velar places of articulation. Some varieties of Zapotec have a contrast between alveopalatal fricatives and retroflex fricatives. Most Rukai dialects have four vowels and retroflex and interdental consonants. Tamil phonology is characterised by the presence of retroflex consonants and multiple rhotic consonants. In general, alveolar consonants are assimilated into palatal, retroflex or labial. Middle Vietnamese is normally reconstructed with two sibilant fricatives, both hushing (one retroflex, one alveolo-palatal). Abkhaz uses it to represent the voiced retroflex affricate . Hindustani also has a phonemic difference between the dental plosives and the so-called retroflex plosives. Tamil phonology is characterised by the presence of retroflex consonants and multiple rhotics. Natsalingmiutut has an additional consonant , a vestige of the retroflex consonants of Proto-Inuit. It is retroflex nasal consonantal sound symbol, used in some spoken languages. In most informal transcriptions the distinction between retroflex and dental consonants is not indicated. Note that is normally realised as or as a retroflex approximant. In Natsilingmiutut, the voiced palatal stop derives from a former retroflex.