U+1D6D9 "𝛙" Mathematical Bold Small Psi Unicode Character
Unicode Version 17.0
𝛙
U+1D6D9 "𝛙" Mathematical Bold Small Psi is an alphabetic symbol representing the twenty-third letter of the Greek alphabet in a bold typeface, specifically designed for mathematical and scientific notation where it is commonly used to denote the wave function in quantum mechanics, the entanglement entropy in information theory, or the digamma function in number theory, and is part of the Mathematical Alphanumeric Symbols block, enabling clear typographic distinction from regular text in technical documents.
General Properties
| Code Point | U+1D6D9 |
| Version Added | 3.1 |
| Name | Mathematical Bold Small Psi |
| Block | Mathematical Alphanumeric Symbols |
| General Category | Lowercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Font |
| Decomposition Mapping | "ψ" U+03C8 Greek Small Letter Psi |
Encodings
| HTML Decimal Encoding | 𝛙 |
| HTML Hex Encoding | 𝛙 |
| UTF-8 Encoding | 0xF0 0x9D 0x9B 0x99 |
| UTF-16 Encoding | 0xD835 0xDED9 |
| UTF-32 Encoding | 0x0001D6D9 |
| C/C++/Java Escape | \ud835\uded9 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Lowercase | Yes |
| Cased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "ψ" U+03C8 Greek Small Letter Psi |
| NFKC Simple Casefold | "ψ" U+03C8 Greek Small Letter Psi |
| 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 | Lower |