The close central unrounded vowel, or high central unrounded vowel, is a type of vowel sound used in some languages. The symbol in the International Phonetic Alphabet that represents this sound is ɨ, namely the lower-case letter i with a horizontal bar. Both the symbol and the sound are commonly referred to as barred i. In American tradition this symbol (and the name "barred i") denote a slightly different sound, that of the second syllable of roses when distinct from Rosa's; see also near-close central unrounded vowel.
Its vowel height is close, also known as high, which means the tongue is positioned as close as possible to the roof of the mouth without creating a constriction that would be classified as a consonant.
Cruz-Ferreira, Madalena (1995), "European Portuguese", Journal of the International Phonetic Association, 25 (2): 90–94, doi:10.1017/S0025100300005223
Ball, Martin J. (1984), "Phonetics for phonology", in Ball, Martin J.; Jones, G.E, Welsh Phonology, Cardiff: University of Wales Press, ISBN0-7083-0861-9
Campbell, Lyle; Kaufman, Terrence; Smith-Stark, Thomas C (1986), "Meso-America as a linguistic area", Language, 62 (3): 530–570, doi:10.2307/415477, JSTOR415477
Firestone, Homer L. (1965), "Description and classification of Sirionó: A Tupí-Guaraní language.", Janua linguarum, Series Practica (16), London: Mouton & Co
Hargus, Sharon; Beavert, Virginia (2002), "Predictable versus Underlying Vocalism in Yakima Sahaptin", International Journal of American Linguistics, 68 (3): 316–340, doi:10.1086/466492
Iivonen, Antti; Harnud, Huhe (2005), "Acoustical comparison of the monophthong systems in Finnish, Mongolian and Udmurt", Journal of the International Phonetic Association, 35 (1): 59–71, doi:10.1017/S002510030500191X