H-bar or h-bar can refer to: *

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'' ...

, a Latin letter H with a doubled horizontal stroke (Ħ ħ) **

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 ...

, represented in IPA by *

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 ...

, in which the above symbol represents as a mathematical symbol, ''ħ'' = *

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 sh ...

, 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