普朗克常量除以二 Pi ℏ

「Planck Constant Over Two Pi」 is used in wave quantum mechanics as a coefficient that relates the basic characteristics of particles, such as vector, momentum, frequency, energy, phase, and action. This separate quantity called the 「Dirac constant」 is equal to the 「Planck Constant」 divided by 2 𝜋 .

To denote this quantity, Unicode has a special symbol. It looks like an italicized Latin letter 「h」. Use the symbol 「Planck Constant Over Two Pi」 in your scientific works, formulas, and calculations. You can find even more special symbols in the blocks 字母式符号  2100–214F and 数学运算符  2200–22FF .

符号 「普朗克常量除以二 Pi」 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。