Planck Constant Over Two Pi


Symbol Meaning

“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 Letterlike Symbols2100–214F and Mathematical Operators2200–22FF .

The symbol “Planck Constant Over Two Pi” is included in the “Letterlike symbols” subblock of the “Letterlike Symbols” block and was approved as part of Unicode version 1.1 in 1993.

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Unicode Name Planck Constant Over Two Pi
Unicode Number
CSS Code
Entity ℏ
Unicode Block Letterlike Symbols
Unicode Subblock Letterlike symbols
Unicode Version 1.1 (1993)
Version 1.1
Block Letterlike Symbols
Type of paired mirror bracket (bidi) None
Composition Exclusion No
Case change 210F
Simple case change 210F
Encoding hex dec (bytes) dec binary
UTF-8 E2 84 8F 226 132 143 14845071 11100010 10000100 10001111
UTF-16BE 21 0F 33 15 8463 00100001 00001111
UTF-16LE 0F 21 15 33 3873 00001111 00100001
UTF-32BE 00 00 21 0F 0 0 33 15 8463 00000000 00000000 00100001 00001111
UTF-32LE 0F 21 00 00 15 33 0 0 253820928 00001111 00100001 00000000 00000000

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