Double-Struck Capital H ℍ

U+210D
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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.

Text is also available in the following languages: Español; Русский;

Unicode Name Double-Struck Capital H
Unicode Number
HTML Code
CSS Code
Entity ℍ
Unicode Block Letterlike Symbols
Unicode Subblock Letterlike symbols
Unicode Version 1.1 (1993)
Version 1.1
Block Letterlike Symbols
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 +
age 1.1
scripts Common
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

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