U+2135 "ℵ" Alef Symbol Unicode Character
Unicode Version 17.0
ℵ
U+2135 "ℵ" Alef Symbol is the first letter of the Hebrew alphabet, commonly used in mathematics and set theory to represent the aleph numbers, which denote the cardinalities of infinite sets, most famously the cardinality of the natural numbers, ℵ₀. This symbol is distinct from the regular Hebrew letter alef and is encoded specifically for mathematical notation to ensure proper typographical rendering and semantic clarity in technical texts.
General Properties
| Code Point | U+2135 |
| Version Added | 1.1 |
| Name | Alef Symbol |
| Unicode 1.0 Name | First Transfinite Cardinal |
| Block | Letterlike Symbols |
| General Category | Other Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Compat |
| Decomposition Mapping | "א" U+05D0 Hebrew Letter Alef |
Encodings
| HTML Decimal Encoding | ℵ |
| HTML Hex Encoding | ℵ |
| UTF-8 Encoding | 0xE2 0x84 0xB5 |
| UTF-16 Encoding | 0x2135 |
| UTF-32 Encoding | 0x00002135 |
| C/C++/Java Escape | \u2135 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "א" U+05D0 Hebrew Letter Alef |
| NFKC Simple Casefold | "א" U+05D0 Hebrew Letter Alef |
| 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 | Upright |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Alphabetic letter |
| Sentence Break | OLetter |