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symbl-data/loc/en/symbols-desc/210E.axyml

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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 [BLOCK:letterlike-symbols] for writing formulas, calculations, examples, and texts on such topics as physics and mathematics.