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Source: Mid central vowel

The mid central vowel (also known as schwa) is a type of vowel sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ə⟩, a rotated lowercase letter e, which is called a "schwa".
While the Handbook of the International Phonetic Association does not define the roundedness of [ə], it is more often unrounded than rounded. The phonetician Jane Setter describes the pronunciation of the unrounded variant as follows: "a sound which can be produced by basically relaxing the articulators in the oral cavity and vocalising." To produce the rounded variant, all that needs to be done in addition to that is to round the lips.
Afrikaans contrasts unrounded and rounded mid central vowels; the latter is usually transcribed with ⟨œ⟩. The contrast is not very stable, and many speakers use an unrounded vowel in both cases.
Danish and Luxembourgish have a mid central vowel that is variably rounded. In other languages, the change in rounding is accompanied with the change in height and/or backness. For instance, in Dutch, the unrounded allophone of /ə/ is mid central unrounded [ə], but its word-final rounded allophone is close-mid front rounded [ø̜], close to the main allophone of /ʏ/.
"Mid central vowel" and "schwa" do not always mean the same thing, and the symbol ⟨ə⟩ is often used for any obscure vowel, regardless of its precise quality. For instance, the unstressed English vowel transcribed ⟨ə⟩ and called "schwa" is a central unrounded vowel that can be close-mid [ɘ], mid [ə] or open-mid [ɜ], depending on the environment.
The French vowel transcribed that way is closer to [ø].
If a mid-central vowel of a language is not a reduced vowel, or if it may be stressed, it may be more unambiguous to transcribe it with one of the other mid-central vowel letters: ⟨ɘ ɜ⟩ for an unrounded vowel or ⟨ɵ ɞ⟩ for a rounded vowel.