双线大写 H ℍ

「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 字母式符号  2100–214F , you will find a lot of beautiful letters there.

符号 「双线大写 H」 包含在 「字母式符号」 块的 「字母符號」 子块中，并在1993年作为Unicode版本1.1的一部分获得批准。