Cyrillic script
Majuscule and minuscule

Capital and lowercase letters were not distinguished in old manuscripts.

Yeri (Ы) was originally a ligature of Yer and I (Ъ + І = Ы). Iotation was indicated by ligatures formed with the letter І: Ꙗ (not an ancestor of modern Ya, Я, which is derived from Ѧ), Ѥ, Ю (ligature of І and ОУ), Ѩ, Ѭ. Sometimes different letters were used interchangeably, for example И = І = Ї, as were typographical variants like О = Ѻ. There were also commonly used ligatures like ѠТ = Ѿ.
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