A voiceless glottal fricative, sometimes called a voiceless glottal transition or an aspirate, is a type of sound used in some spoken languages. It is familiar to English-speakers as the "h" sound in "hut". The symbol in the International Phonetic Alphabet that represents this sound is .
A sound may have real glottal constriction in a number of languages (such as Arabic), making it a true fricative. However, in many languages that have it, it only patterns like a fricative or approximant phonologically, and lacks the usual phonetic characteristics of a consonant. In such languages, has no inherent place or manner of articulation, as well as lacking the height and backness of a vowel. Thus it has been described as neither consonant nor vowel but simply voiceless phonation:
An effort was undertaken at the Kiel Convention in 1989 to move glottal fricatives, both voiceless and voiced, to the approximant cells of the IPA chart. A specifically fricative sound may be indicated with a raising diacritic , and a specifically approximant with a lowering diacritic .
The Shanghainese language, among others, contrasts voiced and voiceless glottal fricatives.
Features of the voiceless glottal fricative:
A nasalized voiceless glottal fricative or approximant is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is .
The sound is nasalized in several languages, apparently due to a connection between glottal and nasal sounds called rhinoglottophilia. Examples of languages where the only h-like sound is nasalized are Krim, Lisu, and Pirahã.
More rarely, a language will contrast oral and nasal . Two such languages are neighboring Bantu languages of Angola and Namibia, Kwangali and Mbukushu. In these languages, vowels following are nasalized, though nasal vowels do not occur elsewhere. A distinction is also reported from Wolaytta, though in that case the nasal is rare. Swazi distinguishes .