U+1FDB "Ί" Greek Capital Letter Iota with Oxia Unicode Character
Unicode Version 17.0
Ί
U+1FDB "Ί" Greek Capital Letter Iota with Oxia is a historic polytonic Greek letter used in classical and liturgical texts to represent a capital iota with an acute accent or oxia, indicating a high pitch or stressed syllable as prescribed by Ancient Greek accentuation rules. It appears within the Unicode block for Greek Extended characters, which supports the encoding of ancient and medieval Greek scripts alongside breathings and other diacritical marks. While modern Greek has largely replaced the oxia with the monotonic tonos accent, this character remains essential for scholarly editions of Homeric poetry, Byzantine hymns, and critical editions of biblical manuscripts to preserve precise orthographic and prosodic details.
General Properties
| Code Point | U+1FDB |
| Version Added | 1.1 |
| Name | Greek Capital Letter Iota with Oxia |
| Block | Greek Extended |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Canonical |
| Decomposition Mapping | "Ί" U+038A Greek Capital Letter Iota with Tonos |
Encodings
| HTML Decimal Encoding | Ί |
| HTML Hex Encoding | Ί |
| UTF-8 Encoding | 0xE1 0xBF 0x9B |
| UTF-16 Encoding | 0x1FDB |
| UTF-32 Encoding | 0x00001FDB |
| C/C++/Java Escape | \u1fdb |
Unicode Properties
| Full Composition Exclusion | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Uppercase | Yes |
| Simple Lowercase Code Point | "ί" U+1F77 Greek Small Letter Iota with Oxia |
| Lowercase Code Point | "ί" U+1F77 Greek Small Letter Iota with Oxia |
| Simple Case Folding | "ί" U+1F77 Greek Small Letter Iota with Oxia |
| Case Folding | "ί" U+1F77 Greek Small Letter Iota with Oxia |
| Cased | Yes |
| Changes When Casefolded | Yes |
| Changes When Casemapped | Yes |
| Changes When Lowercased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "ί" U+03AF Greek Small Letter Iota with Tonos |
| NFKC Simple Casefold | "ί" U+03AF Greek Small Letter Iota with Tonos |
| Script | Greek |
| Script Extensions | Greek |
| 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 |