Hbar
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 * Reduced Planck constant, in which the above symbol represents as a mathematical symbol, ''ħ'' = * Antihydrogen, an antimatter element represented by the symbol * Steyr AUG HBAR, a light machine gun version of the AUG assault rifle * Multirests, indicated in musical notation through H-bars * HBAR cryptocurrency, for Hedera Hashgraph's public distributed ledger See also *Horizontal bar * *Maltese alphabet The Maltese alphabet is based on the Latin alphabet with the addition of some letters with diacritic marks and Digraph (orthography), digraphs. It is used to write the Maltese language, which evolved from the otherwise extinct Siculo-Arabic diale ...

Reduced Planck Constant
The Planck constant, or Planck's constant, denoted by h, is a fundamental physical constant 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. The constant was postulated by Max Planck in 1900 as a proportionality constant needed to explain experimental black-body radiation. Planck later referred to the constant as the "quantum of action". In 1905, Albert Einstein associated the "quantum" or minimal element of the energy to the electromagnetic wave itself. Max Planck received the 1918 Nobel Prize in Physics "in recognition of the services he rendered to the advancement of Physics by his discovery of energy quanta". In metrology, the Planck constant is used, together with other constants, to define the kilogram, the SI unit of mass. The SI units are defined in such a way that, when the Pla ...
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H With Stroke
H, or h, is the eighth letter of the Latin alphabet, used in the modern English alphabet, including the alphabets of other western European languages and others worldwide. Its name in English is ''aitch'' (pronounced , plural ''aitches''), or regionally ''haitch'' (pronounced , plural ''haitches'')''.''"H" ''Oxford English Dictionary,'' 2nd edition (1989); ''Merriam-Webster's Third New International Dictionary of the English Language, Unabridged'' (1993); "aitch" or "haitch", op. cit. Name English For most English speakers, the name for the letter is pronounced as and spelled "aitch" or occasionally "eitch". The pronunciation and the associated spelling "haitch" are often considered to be h-adding and are considered non-standard in England. It is, however, a feature of Hiberno-English, and occurs sporadically in various other dialects. The perceived name of the letter affects the choice of indefinite article before initialisms beginning with H: for example "an H-bomb" ...
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Voiceless Pharyngeal Fricative
The voiceless pharyngeal fricative is a type of consonantal sound, used in some Speech communication, spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is an h with stroke, h-bar, , 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 , . Typically characterized as fricative in the upper pharynx, it is often characterized as a whispering, whispered . Features Features of the voiceless pharyngeal fricative: Occurrence This sound is the most commonly cited realization of the Semitic letter hēth, which occurs in all dialects of Arabic language, Arabic, Syriac language, Classical Syriac, Western Neo-Aramaic, Central Neo-Aramaic, Ge'ez language, Ge'ez, Tigre language, Tigre, Tigrinya language, Tigrinya as well as Biblical Hebrew, Biblical, Mishnaic Hebrew, Mishnaic and Mizrahi Hebrew, Mizrahi Hebrew language, Hebrew. I ...
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Antihydrogen
Antihydrogen () is the antimatter counterpart of hydrogen. Whereas the common hydrogen atom is composed of an electron and proton, the antihydrogen atom is made up of a positron and antiproton. Scientists hope that studying antihydrogen may shed light on the question of why there is more matter than antimatter in the observable universe, known as the baryon asymmetry problem. Antihydrogen is produced artificially in particle accelerators. Experimental history Accelerators first detected hot antihydrogen in the 1990s. ATHENA studied cold in 2002. It was first trapped by the Antihydrogen Laser Physics Apparatus (ALPHA Collaboration, ALPHA) team at CERN in 2010, who then measured the structure and other important properties. ALPHAAEgIS and GBAR plan to further cool and study atoms. 1s–2s transition measurement In 2016, the Antiproton Decelerator#ALPHA, ALPHA experiment measured the atomic electron transition between the two lowest energy levels of antihydrogen, 1s–2s. The ...
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Steyr AUG HBAR
The Steyr AUG () is an Austrian bullpup assault rifle chambered for the 5.56×45mm NATO intermediate cartridge, designed in the 1960s by Steyr-Daimler-Puch, and now manufactured by Steyr Arms GmbH & Co KG. The AUG was adopted by the Austrian Army in 1977 as the StG 77 (''Sturmgewehr 77''), where it replaced the 7.62×51mm NATO StG 58 automatic rifle.Ezell (1993) p. 223 In production since 1977, it is the standard small arm of the '' Bundesheer'' and various Austrian federal police units and its variants have also been adopted by the armed forces of dozens of countries, with some using it as a standard-issue service rifle. The importation of the Steyr AUG into the United States began in the 1980s as the AUG/SA (SA denoting semi-automatic). The AUG was banned from importation in 1989 under President George H. W. Bush's executive order restricting the import of foreign-made semiautomatic rifles deemed not to have "a legitimate sporting use." Six years into the ban, AUG buye ...
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