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"Ё" is a letter in the Cyrillic alphabet (used in Russian and some other languages) that represents a distinct vowel sound with a "yo" pronunciation. It is essentially the same as the Cyrillic letter "E" but with two dots above it, and while it marks an important sound difference in the language, it is often omitted in written Russian in everyday use.
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Monument in Ulyanovsk marking the 200th anniversary of the letter Yo.