普朗克常量 ℎ

The 「Planck Constant」 is one of the fundamental measurements of quantum theory. It has a precisely fixed value and it describes the relationship between the energy of a quantum and its frequency.

To denote the Planck constant, the lowercase italic Latin letter 「h」 is used. Unicode offers a special symbol for this physical quantity with the same name. Use the 「Planck Constant」 symbol from 字母式符号  2100–214F for writing formulas, calculations, examples, and texts on such topics as physics and mathematics.

符号 「普朗克常量」 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。