U+0451 "ё" Cyrillic Small Letter Io Unicode Character

U+0451 "ё" Cyrillic Small Letter Io is a distinct glyph in the Cyrillic script, representing the letter "yo" in Russian and other languages, where it is used to denote the sound [jo] or [ʲo] after a soft consonant. It is formed by placing a diaeresis, two dots, above the Cyrillic letter "е" (ie), and it appears in positions where stress is implied or to differentiate homographs, such as "всё" (everything) versus "все" (everyone). Historically, its introduction is credited to the Russian historian and writer Nikolai Karamzin in the late 18th century, though its usage remains optional and often contested in modern typography, with many writers preferring "е" in contexts where the pronunciation is clear.