U+2131 "ℱ" Script Capital F Unicode Character
Unicode Version 17.0
ℱ
U+2131 "ℱ" Script Capital F is a typographic symbol that represents a stylized, cursive capital letter F, often used in mathematical and scientific contexts to denote a Fourier transform or a function space, such as the space of Schwartz functions. It belongs to the Letterlike Symbols block of Unicode, designed to distinguish script-style letters from ordinary alphabetic characters in formal notation. This character is distinct from the standard Latin capital F, providing a clear visual cue for specialized mathematical operators and variables in academic and technical documents.
General Properties
| Code Point | U+2131 |
| Version Added | 1.1 |
| Name | Script Capital F |
| Unicode 1.0 Name | Script F |
| Block | Letterlike Symbols |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Font |
| Decomposition Mapping | "F" U+0046 Latin Capital Letter F |
Encodings
| HTML Decimal Encoding | ℱ |
| HTML Hex Encoding | ℱ |
| UTF-8 Encoding | 0xE2 0x84 0xB1 |
| UTF-16 Encoding | 0x2131 |
| UTF-32 Encoding | 0x00002131 |
| C/C++/Java Escape | \u2131 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Uppercase | Yes |
| Cased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "f" U+0066 Latin Small Letter F |
| NFKC Simple Casefold | "f" U+0066 Latin Small Letter F |
| Script | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| ID Start | Yes |
| XID Start | Yes |
| ID Continue | Yes |
| XID Continue | Yes |
| Alphabetic | Yes |
| Math | Yes |
| Other Math | Yes |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Alphabetic letter |
| Sentence Break | Upper |