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H-bar or h-bar can refer to: . H with stroke, a Latin letter H with a doubled horizontal stroke (Ħ ħ) . Voiceless pharyngeal fricative, represented in IPA by ħ ; Reduced Planck constant, in which the above symbol represents as a mathematical symbol, ħ = h/(2π)
The lowercase resembles the Cyrillic letter Tshe (ћ), or the astronomical symbol of Saturn (♄). A white uppercase Ħ on a red square was the logo of Heritage Malta until 2022. [3] It is used as the symbol for Hedera Hashgraph's native cryptocurrency, HBAR. [4]
The Planck constant, or Planck's constant, denoted by , [1] is a fundamental physical constant [1] of foundational importance in quantum mechanics: a photon's energy is equal to its frequency multiplied by the Planck constant, and the wavelength of a matter wave equals the Planck constant divided by the associated particle momentum.
If, by a shorthand convention, it is understood that each physical quantity is the corresponding ratio with a coherent Planck unit (or "expressed in Planck units"), the ratios above may be expressed simply with the symbols of physical quantity, without being scaled explicitly by their corresponding unit: ′ = ′ ′ ′.
The Planck relation [1] [2] [3] (referred to as Planck's energy–frequency relation, [4] the Planck–Einstein relation, [5] Planck equation, [6] and Planck formula, [7] though the latter might also refer to Planck's law [8] [9]) is a fundamental equation in quantum mechanics which states that the energy E of a photon, known as photon energy, is proportional to its frequency ν: =.
The symbol in the International Phonetic Alphabet that represents this sound is an h-bar, ħ , and the equivalent X-SAMPA symbol is X\. In the transcription of Arabic, Berber (and other Afro-Asiatic languages) as well as a few other scripts, it is often written Ḥ , ḥ .
A FBI document obtained by Wikileaks details the symbols and logos used by pedophiles to identify sexual preferences. According to the document members of pedophilic organizations use of ...
Symbol Name Meaning SI unit of measure alpha: alpha particle: angular acceleration: radian per second squared (rad/s 2) fine-structure constant: unitless beta: velocity in terms of the speed of light c: unitless beta particle: gamma: Lorentz factor: unitless photon: gamma ray: shear strain: radian