U+2119 "ℙ" Double-Struck Capital P Unicode Character
Unicode Version 17.0
ℙ
U+2119 "ℙ" Double-Struck Capital P is a mathematical symbol typically used to denote the set of prime numbers or, in some contexts, the projective plane or probability measures. It belongs to the group of double-struck (also called blackboard bold) letters, which are commonly employed in mathematics to represent specific number sets, such as ℕ for natural numbers, ℤ for integers, and ℙ for primes. This character can be found in the Letterlike Symbols block of Unicode and is distinct from the ordinary Latin capital P, serving a specialized function in academic and technical writing to avoid ambiguity.
General Properties
| Code Point | U+2119 |
| Version Added | 1.1 |
| Name | Double-Struck Capital P |
| Unicode 1.0 Name | Double-Struck P |
| Block | Letterlike Symbols |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Font |
| Decomposition Mapping | "P" U+0050 Latin Capital Letter P |
Encodings
| HTML Decimal Encoding | ℙ |
| HTML Hex Encoding | ℙ |
| UTF-8 Encoding | 0xE2 0x84 0x99 |
| UTF-16 Encoding | 0x2119 |
| UTF-32 Encoding | 0x00002119 |
| C/C++/Java Escape | \u2119 |
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 | "p" U+0070 Latin Small Letter P |
| NFKC Simple Casefold | "p" U+0070 Latin Small Letter P |
| 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 |