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 back rounded vowel and are used in different transcription systems to represent the same sound. The close back protruded vowel is the most common variant of the close back rounded vowel. It is typically transcribed in IPA simply as , which is the convention used in this article. As there is no dedicated IPA diacritic for protrusion, the symbol for the close back rounded vowel with an old diacritic for labialization, , can be used as an "ad hoc" symbol . Another possible transcription is or (a close back vowel modified by endolabialization), but that could be misread as a diphthong. Some languages,