https://www.worldatlas.com/articles/what-is-a-cyrillic-alphabet.html
Jun 18, 2018 · Currently, Cyrillic is in use by more than 50 languages, including Russian, Ukrainian, Serbian, Kazakh, Turkmen, and many more. The Cyrillic Alphabets also have an interesting story behind their origins. ... There are 33 letters in the Russian Cyrillic alphabet, of which 10 are vowel letters, 21 are consonant letters, and two are signs. ...