Cyrillic script - Wikipedia
en.wikipedia.org › wiki › Cyrillic_scriptIn Bulgarian, Macedonian, Russian, Serbian, Czech and Slovak, the Cyrillic alphabet is also known as azbuka, derived from the old names of the first two letters of most Cyrillic alphabets (just as the term alphabet came from the first two Greek letters alpha and beta). In Czech and Slovak, which have never used Cyrillic, "azbuka" refers to ...
Early Cyrillic alphabet - Wikipedia
https://en.wikipedia.org/wiki/Early_Cyrillic_alphabetThe Early Cyrillic alphabet, also called classical Cyrillic or paleo-Cyrillic, is a writing system that was developed in the First Bulgarian Empire during the late 9th century on the basis of the Greek alphabet for the Slavic peoples living near the Byzantine Empire in South East and Central Europe. It was used by Slavic peoples in South East, Central and Eastern Europe.