э

For the letter E (Е, е) of the Bulgarian, Serbian and Ukrainian alphabets, see Ye (Cyrillic). E or E Oborotnoye (Backwards E) (Э, э) is a letter found in several Cyrillic alphabets, typically representing the non-iotated vowel, IPA: . In Cyrillic Moldovan, which was used in Soviet era Moldova and is still used in Transnistria, this letter represents the schwa: .
See more at Wikipedia.org...

eh, expression of inquiry or surprise (expression of uncertainty or doubt)