Cyrillic alphabet

Cyrillic letters are used for certain Slavic languages, principally Russian. Based on Greek letters, it has a longer alphabet than do the Roman or Greek alphabet, to better accommodate the different phonemes encountered in Slavic languages. They are named for Saint Cyril, who, with his brother Saint Methodius, were apostles to the Slavs, much as Saint Patrick was apostle to the Celts. Cyril is usually credited for devising Glagolithic letters (for Croatian), but the attribution to him for Cyrillic letters is less firm.

The Old Church Slavonic (OCS) version of the Bible is close to what the historical linguists term proto-Slavic, but is actually a very old form of Bulgarian/Proto-South-Slavic. Cyrillic letters are used for this version of Scripture.

The alphabet itself showing both upper and lower cases:
А а Б б В в Г г Ґ ґ Ѓ ѓ Д д Ђ ђ Е е Ё ё Є є Ж ж З з Ѕ ѕ И и І і Ї ї Й й Ј ј К к Ќ ќ Л л Љ љ М м Н н Њ њ О о П п Р р С с Т т Ћ ћ У у Ў ў Ф ф Х х Ц ц Ч ч Џ џ Ш ш Щ щ Ъ ъ Ы ы Ь ь Э э Ю ю Я я