Double-Struck Capital H ℍ
Symbol Meaning
“Double-Struck Capital H” is used to denote quaternions — a system proposed by Hamilton in the middle of the 19th century. It includes hypercomplex numbers that describe the isometry of Euclidean spaces and it is used in mechanics and calculations. Anyway, if you are looking for a symbol specifically for quaternions, most likely you already know what it looks like and no explanation is needed.
The Unicode “Double-Struck Capital H” can be used not only in physical and mathematical formulas. If you like it, copy it to your title, nickname, logo, social media post. And also take a look at Letterlike Symbols2100–214F , you will find a lot of beautiful letters there.
The symbol “Double-Struck Capital H” is included in the “Letterlike symbols” subblock of the “Letterlike Symbols” block and was approved as part of Unicode version 1.1 in 1993.
| Unicode Name | Double-Struck Capital H |
| Unicode Number | |
| HTML Code | |
| CSS Code | |
| Entity | ℍ |
| Plane | 0: Basic Multilingual Plane |
| Unicode Block | Letterlike Symbols |
| Unicode Subblock | Letterlike symbols |
| Unicode Version | 1.1 (1993) |
| Type of paired mirror bracket (bidi) | None |
| Composition Exclusion | No |
| Case change | 210D |
| Simple case change | 210D |
| Math | + |
| Alphabetic | + |
| Uppercase | + |
| Cased | + |
| ID_Start | + |
| ID_Continue | + |
| XID_Start | + |
| XID_Continue | + |
| Grapheme_Base | + |
| scripts | Common |
| Other_Math | + |
| Encoding | hex | dec (bytes) | dec | binary |
|---|---|---|---|---|
| UTF-8 | E2 84 8D | 226 132 141 | 14845069 | 11100010 10000100 10001101 |
| UTF-16BE | 21 0D | 33 13 | 8461 | 00100001 00001101 |
| UTF-16LE | 0D 21 | 13 33 | 3361 | 00001101 00100001 |
| UTF-32BE | 00 00 21 0D | 0 0 33 13 | 8461 | 00000000 00000000 00100001 00001101 |
| UTF-32LE | 0D 21 00 00 | 13 33 0 0 | 220266496 | 00001101 00100001 00000000 00000000 |