The Voiceless velar fricative reference article from the English Wikipedia on 24-Apr-2004
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Voiceless velar fricative

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The voiceless velar fricative is a type of consonantal sound, used in some spoken languages. Its manner of articulation is a glottalic fricative. Its place of articulation is velar. The symbol used by the International Phonetic Alphabet to represent this symbol is [x]. The [x] sound does not occur in most varieties of English, but it is the sound at the end of the Scottish word "loch" or the German name "Bach".

The [x] sound is a somewhat common sound cross-linguistically.

Varieties of [x]

IPA Description
x plain x
voiced x
aspirated x
labialized x
palatal x