U+1EE9 "ứ" Latin Small Letter U with Horn and Acute Unicode Character
Unicode Version 17.0
ứ
U+1EE9 "ứ" Latin Small Letter U with Horn and Acute is a precomposed letter used in the Vietnamese alphabet to represent a specific tonal variation of the vowel "u". It combines a base Latin small letter u with a diacritical "horn" attached to its upper right side, which indicates a distinct vowel quality, and an acute accent mark placed above the letter to denote the rising tone. This character is essential for accurately writing and pronouncing Vietnamese words where the vowel sound requires both the horn modification and the acute tone, and it corresponds to the codepoint U+1EE9 in the Unicode Standard for consistent digital representation.
General Properties
| Code Point | U+1EE9 |
| Version Added | 1.1 |
| Name | Latin Small Letter U with Horn and Acute |
| Block | Latin Extended Additional |
| General Category | Lowercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Canonical |
| Decomposition Mapping | "ư" U+01B0 Latin Small Letter U with Horn "́" U+0301 Combining Acute Accent |
Encodings
| HTML Decimal Encoding | ứ |
| HTML Hex Encoding | ứ |
| UTF-8 Encoding | 0xE1 0xBB 0xA9 |
| UTF-16 Encoding | 0x1EE9 |
| UTF-32 Encoding | 0x00001EE9 |
| C/C++/Java Escape | \u1ee9 |
Unicode Properties
| NFC Quick Check | Yes |
| NFKC Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Lowercase | Yes |
| Simple Uppercase Code Point | "Ứ" U+1EE8 Latin Capital Letter U with Horn and Acute |
| Simple Titlecase Code Point | "Ứ" U+1EE8 Latin Capital Letter U with Horn and Acute |
| Uppercase Code Point | "Ứ" U+1EE8 Latin Capital Letter U with Horn and Acute |
| Titlecase Code Point | "Ứ" U+1EE8 Latin Capital Letter U with Horn and Acute |
| Cased | Yes |
| Changes When Casemapped | Yes |
| Changes When Titlecased | Yes |
| Changes When Uppercased | Yes |
| Script | Latin |
| Script Extensions | Latin |
| 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 | Lower |