U+FF91 "ﾑ" Halfwidth Katakana Letter Mu Unicode Character
Unicode Version 17.0
ﾑ
U+FF91 "ﾑ" Halfwidth Katakana Letter Mu is a narrow, halfwidth version of the standard fullwidth Katakana letter ム, which represents the syllable "mu." As part of the Halfwidth and Fullwidth Forms block in Unicode, it was designed primarily for compatibility with legacy character encodings and older computer systems that used a monospaced grid with a limited character width. Its usage has largely diminished in modern text, but it may still appear in contexts where preserving historical formatting or aligning with specific fixed-width character sets is necessary.
General Properties
| Code Point | U+FF91 |
| Version Added | 1.1 |
| Name | Halfwidth Katakana Letter Mu |
| Block | Halfwidth and Fullwidth Forms |
| General Category | Other Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Narrow |
| Decomposition Mapping | "ム" U+30E0 Katakana Letter Mu |
Encodings
| HTML Decimal Encoding | ﾑ |
| HTML Hex Encoding | ﾑ |
| UTF-8 Encoding | 0xEF 0xBE 0x91 |
| UTF-16 Encoding | 0xFF91 |
| UTF-32 Encoding | 0x0000FF91 |
| C/C++/Java Escape | \uff91 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Ideographic |
| East Asian Width | Halfwidth |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "ム" U+30E0 Katakana Letter Mu |
| NFKC Simple Casefold | "ム" U+30E0 Katakana Letter Mu |
| Script | Katakana |
| Script Extensions | Katakana |
| 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 | Katakana |
| Sentence Break | OLetter |