The Venn diagram above reveals the 11 letters that are common to the Cyrillic, Latin, and Greek alphabets; Greek is on the left, Cyrillic is on the bottom, and Latin is on the right. Greek is considered to be the first “true” alphabet because it assigned letters to both vowels and consonants. Since Greek influenced much of Latin and Cyrillic, it is not surprising that there are still similar characters between the three alphabets — even thousands of years later.
(via ilove charts)