Yery
Yery (Ы, ы) is a letter in the Cyrillic alphabet. It represents the phoneme /i/ after non-palatalized (hard) consonants in the Belarusian and Russian alphabets. Because of phonological processes, the actual realization of /i/ after hard consonants is retracted to a close central unrounded vowel (IPA [ɨ]).
Like many Cyrillic letters, originally the letter yery was formed from a ligature—between Yer Ъ and Izhe (then I) or Izhei (then Н, now И). In ancient manuscripts, it is almost without exception found as ЪІ or ЪН. Once the letters Ъ and Ь subsequently lost their values as vowels from the Slavonic language, the current form Ы evolved.
The yery is theoretically never capitalized because no words start with it, but Cyrillic type faces do normally provide an uppercase form for setting type in all caps.
Yery is no longer found in the Ukrainian alphabet, however a similar sound exists, represented by the letter И