О

О (Cyrillic Capital Letter O, U+041E) is an uppercase letter widely used in various Cyrillic-script languages, including Russian, Ukrainian, Bulgarian, Serbian, and others, where it typically represents the /o/ sound. Visually, it is identical in shape to the Latin Capital Letter O (U+004F), making it a classic example of a homoglyph – characters that look the same but are distinct Unicode entities belonging to different scripts. Historically, the Cyrillic letter O is derived from the Greek letter Omicron. This visual similarity underscores an important principle of Unicode, where characters are distinguished by their script and unique identity, ensuring proper rendering and processing in digital text, even when they appear indistinguishable to the human eye.