Close-mid central unrounded vowel Close-mid central unrounded vowel The close-mid central unrounded vowel, or high-mid central unrounded vowel, is a type of vowel sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is . This is a mirrored letter e, and should not be confused with the schwa , which is a turned e. It was added to the IPA in 1993; before that, this vowel was transcribed (Latin small letter e with umlaut, not Cyrillic small letter yo). Certain older sources transcribe this vowel . The letter may be used with a lowering diacritic ,
Close-mid back rounded vowel in this article. As there is no dedicated diacritic for protrusion in the IPA, the symbol for the close-mid back rounded vowel with an old diacritic for labialization, , can be used as an "ad hoc" symbol for the close-mid back protruded vowel. Another possible transcription is or (a close-mid back vowel modified by endolabialization), but this could be misread as a diphthong. For the close-mid near-back protruded vowel that is usually transcribed with the symbol , see near-close back protruded vowel. If the usual symbol is , the vowel is listed here. "Note: Because back rounded vowels are assumed