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The voiceless alveolar sibilant is a common consonant sound in vocal languages. It is the sound in English words such as sea and pass, and is represented in the International Phonetic Alphabet with ⟨s⟩. It has a characteristic high-pitched, highly perceptible hissing sound. For this reason, it is often used to get someone's attention, using a call often written as sssst! or psssst!.
The voiceless alveolar sibilant is one of the most common sounds cross-linguistically. If a language has fricatives, it will most likely have. However, some languages have a related sibilant sound, such as , but no. In addition, sibilants are absent from Australian Aboriginal languages, in which fricatives are rare; even the few indigenous Australian languages that have fricatives do not have sibilants.
The voiceless alveolar retracted sibilant is a fricative that is articulated with the tongue in a hollow shape, usually with the tip of the tongue against the alveolar ridge. It is a sibilant sound and is found most notably in a number of languages in a linguistic area covering northern and central Iberia. It is most well known from its occurrence in the Spanish of this area. In the Middle Ages, it occurred in a wider area, covering Romance languages spoken throughout France, Portugal, and Spain, as well as Old High German and Middle High German.
In Romance languages, it occurs as the normal voiceless alveolar sibilant in Astur-Leonese, Castilian Spanish, Catalan, Galician, northern European Portuguese, and some Occitan dialects. It also occurs in Basque and Mirandese, where it is opposed to a different voiceless alveolar sibilant, the more common ; the same distinction occurs in a few dialects of northeastern Portuguese. Outside this area, it also occurs in a few dialects of Latin American Spanish.