In linguistics, voicelessness is the property of sounds being pronounced without the larynx vibrating. Phonologically, it is a type of phonation, which contrasts with other states of the larynx, but some object that the word phonation implies voicing and that voicelessness is the lack of phonation. The International Phonetic Alphabet has distinct letters for many voiceless and modally voiced pairs of consonants (the obstruents), such as . Also, there are diacritics for voicelessness, and , which is used for letters with a descender. Diacritics are typically used with letters for prototypically voiced sounds, such as vowels and sonorant consonants: . In Russian use of the IPA, the voicing diacritic may be turned for voicelessness, e.g. . Voiceless vowels and other sonorants Sonorants are sounds such as vowels and nasals that are voiced in most of the world's languages. However, in some languages sonorants may be voiceless, usually allophonically. For example, the Japanese word sukiyaki is pronounced and may sound like to an English speaker, but the lips can be seen to compress for the . Something similar happens in English words like peculiar and potato . Voiceless vowels are also an areal feature in languages of the American Southwest (like Hopi and Keres), the Great Basin (including all Numic languages), and the Great Plains, where they are present in Numic Comanche but also in Algonquian Cheyenne, and the Caddoan language Arikara. Sonorants may also be contrastively, not just environmentally, voiceless. Standard Tibetan, for example, has a voiceless in Lhasa, which sounds similar to but is less noisy than the voiceless lateral fricative in Welsh; it contrasts with a modally voiced . Welsh contrasts several voiceless sonorants: , , , and , the last represented by "rh". In Moksha, there is even a voiceless palatal approximant (written in Cyrillic as jh) along with and (written as lh and rh). The last two have palatalized counterparts and ( and ). Kildin Sami has also . Contrastively voiceless vowels have been reported several times without ever being verified (L&M 1996:315). Lack of voicing contrast in obstruents Many languages lack a distinction between voiced and voiceless obstruents (stops, affricates, and fricatives). This is the case in nearly all Australian languages, and is widespread elsewhere, for example in Mandarin Chinese, Korean, Danish, Finnish, Estonian and the Polynesian languages. In many such languages, obstruents are realized as voiced in voiced environments, such as between vowels or