U+A66A "Ꙫ" Cyrillic Capital Letter Binocular O Unicode Character
U+A66A "Ꙫ" Cyrillic Capital Letter Binocular O is a rare and specialized glyph used primarily in historical Church Slavonic manuscripts, where it represents a doubled or binocular form of the standard Cyrillic O. This character, along with its lowercase counterpart, was employed to denote the dual number in certain grammatical contexts or to serve as a decorative or phonetic variant in religious texts. It belongs to the Cyrillic Extended-B block, which contains a number of archaic and liturgical characters not commonly found in modern Cyrillic alphabets. Because its usage is confined to paleography and linguistic reconstruction, the Binocular O is not supported in many standard fonts and often requires specialized typographic systems to render correctly.
General Properties
| Code Point | U+A66A |
| Version Added | 5.1 |
| Name | Cyrillic Capital Letter Binocular O |
| Block | Cyrillic Extended-B |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
Encodings
| HTML Decimal Encoding | Ꙫ |
| HTML Hex Encoding | Ꙫ |
| UTF-8 Encoding | 0xEA 0x99 0xAA |
| UTF-16 Encoding | 0xA66A |
| UTF-32 Encoding | 0x0000A66A |
| C/C++/Java Escape | \ua66a |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| NFKC Quick Check | Yes |
| NFKD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Uppercase | Yes |
| Simple Lowercase Code Point | "ꙫ" U+A66B Cyrillic Small Letter Binocular O |
| Lowercase Code Point | "ꙫ" U+A66B Cyrillic Small Letter Binocular O |
| Simple Case Folding | "ꙫ" U+A66B Cyrillic Small Letter Binocular O |
| Case Folding | "ꙫ" U+A66B Cyrillic Small Letter Binocular O |
| Cased | Yes |
| Changes When Casefolded | Yes |
| Changes When Casemapped | Yes |
| Changes When Lowercased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "ꙫ" U+A66B Cyrillic Small Letter Binocular O |
| NFKC Simple Casefold | "ꙫ" U+A66B Cyrillic Small Letter Binocular O |
| Script | Cyrillic |
| Script Extensions | Cyrillic |
| Indic Syllabic Category | Other |
| ID Start | Yes |
| XID Start | Yes |
| ID Continue | Yes |
| XID Continue | Yes |
| Alphabetic | Yes |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Alphabetic letter |
| Sentence Break | Upper |