The open-mid central unrounded vowel, or low-mid central unrounded vowel,[1] is a type of vowel sound, used in some spokenlanguages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ɜ⟩ (formerly ⟨ᴈ⟩). The IPA symbol is not the digit ⟨3⟩ or the Cyrillic small letter Ze (з). The symbol is instead a reversed Latinized variant of the lowercase epsilon, ɛ. The value was specified only in 1993; until then, ⟨ɜ⟩ was an alternative symbol for the mid central unrounded vowel[ə].
Conversely, ⟨ə⟩, the symbol for the mid central vowel may be used with a lowering diacritic ⟨ə̞⟩ to denote the open-mid central unrounded vowel, although that is more specifically written with an additional unrounding diacritic ⟨ə̞͑⟩ to explicitly denote the lack of rounding (the canonical value of IPA ⟨ə⟩ is undefined for rounding).
^Volpe, Luigi (2011). La lingua dei masciaioli : dizionario del dialetto di Accettura, cittadina lucana in provincia di Matera / Luigi Volpe ; presentazione [di] Patrizia Del Puente (in Italian). Potenza: EditricErmes.
Collins, Beverley; Mees, Inger M. (2003) [First published 1981], The Phonetics of English and Dutch (5th ed.), Leiden: Brill Publishers, ISBN9004103406
Gordon, Matthew J.; Maddieson, Ian (1996), "The phonetics of Paici", in Maddieson, Ian (ed.), UCLA working papers in phonetics: Fieldwork studies of targeted languages IV, vol. 93, Los Angeles: The UCLA Phonetics Laboratory Group, pp. 111–124
Gordon, Matthew (2004b), "The West and Midwest: phonology", in Kortmann, Bernd; Schneider, Edgar W. (eds.), A Handbook of Varieties of English: Volume 1: Phonology, Walter de Gruyter, p. 340, ISBN3-11-017532-0
Kanu, Sullay M.; Tucker, Benjamin V. (2010), "Temne", Journal of the International Phonetic Association, 40 (2): 247–253, doi:10.1017/S002510031000006X
Kerr, Harland (1988), "Cotabato Manobo Grammar"(PDF), Studies in Philippine Linguistics, 7 (1): 1–123, archived from the original(PDF) on 2015-05-11
Nihalani, Paroo (1999), "Sindhi", Handbook of the International Phonetic Association, Cambridge University Press, pp. 131–134, ISBN0-521-63751-1
Pop, Sever (1938), Micul Atlas Linguistic Român, Muzeul Limbii Române Cluj
Roach, Peter (2004), "British English: Received Pronunciation", Journal of the International Phonetic Association, 34 (2): 239–245, doi:10.1017/S0025100304001768
Sarlin, Mika (2014) [First published 2013], "Sounds of Romanian and their spelling", Romanian Grammar (2nd ed.), Helsinki: Books on Demand GmbH, pp. 16–37, ISBN978-952-286-898-5
Schuh, Russell G.; Yalwa, Lawan D. (1999), "Hausa", Handbook of the International Phonetic Association, Cambridge University Press, pp. 90–95, ISBN0-521-63751-1
Thomas, Erik R. (2001), An acoustic analysis of vowel variation in New World English, Publication of the American Dialect Society, vol. 85, Duke University Press for the American Dialect Society, ISSN0002-8207
Tillery, Jan; Bailey, Guy (2004), "The urban South: phonology", in Kortmann, Bernd; Schneider, Edgar W. (eds.), A Handbook of Varieties of English: Volume 1: Phonology, Walter de Gruyter, p. 333, ISBN3-11-017532-0