Letterlike Symbols: Double-Struck Capital H

ℍ

U+210D

ℍ

Noto text font

Plane: 0 (Basic Multilingual)
Block: Letterlike Symbols
Unicode Version: 1.1

UTF-32BE: 00 00 21 0D
UTF-32LE: 0D 21 00 00
UTF-16BE: 21 0D
UTF-16LE: 0D 21
UTF-8: E2 84 8D

Character Escapes

HTML5: ℍ; ℍ; &Hopf;; &quaternions;
C: \u210D (C99); \U00210D (C99)
C++: \u{210D} (C++23); \U0000210D; \u210D
Java: \u210D
JavaScript: \u{210D}; \u210D
CSS: \210D; \00210D
Quoted-Printable: =E2=84=8D
URL: %E2%84%8D