h

n. eighth letter of the English alphabet

n. colorless odorless gas (lightest of the known elements)

H is the eighth letter in the Latin alphabet. Its name in English is spelled aitch, pronounced IPA  in most dialects, though in Irish and Indian English it is generally haitch . (See the discussion below on the two pronunciations.)See alphabetIn the International Phonetic Alphabet, this symbol is used to represent two sounds. Its lowercase form, , represents the voiceless glottal fricative or 'aspirate', and its small capital form, , represents the voiceless epiglottal fricative.
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Backspace is the keyboard key that originally pushed the typewriter carriage one position backwards, and in modern computer displays moves the cursor one position backwards, deletes the preceding character, and shifts back the text after it by one position.In typewriters, a typist would, for example, type a lowercase letter A with acute accent (á) by typing a lowercase letter A, backspace and then the acute accent key (also known as overstrike). This is the basis for such spacing modifiers in computer character sets such as the ASCII caret (^, for the circumflex accent). Backspace composition no longer works with digital displays or typesetting systems. It has to some degree been replaced with the combining diacritical marks mechanism of Unicode, though such characters do not work well with many fonts, and precomposed characters continue to be used. Some software like TeX or Microsoft Windows use the opposite method for diacritical marks, namely positioning the accent first, and then the base letter on its position.
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H+ or h+ could mean:Hydrogen ion, H+Electron hole, h+H (S-train)Transhumanism, H+, >H
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In computer programming, particularly in the C and C++ programming languages, a header file or include file is a file, usually in the form of source code, that is automatically included in another source file by the compiler. Typically, header files are included via compiler directives at the beginning (or head) of the other source file.
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Ænima is the second full-length studio album by the American rock band Tool. It was released on October 1 1996 in CD format and in vinyl format the week before. The album was recorded and cut at Ocean Way, Hollywood, California and The Hook, North Hollywood, California from 1995 to 1996. It was certified triple platinum by the RIAA on March 4, 2003.
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Ĥ, or ĥ is a consonant in Esperanto orthography, representing a voiceless velar fricative  or voiceless uvular fricative .In the case of the minuscule, some fonts place the circumflex over the riser of the base letter h, others over the shoulder, and others centred above the entire letter.Ĥ is falling out of use among some Esperanto speakers, being generally replaced by the letter k. However, several words are still commonly used with ĥ, particularly ones in which there is another word that uses "k" in that context. For example, eĥo ("echo") or ĥoro ("chorus") are distinguished from eko ("beginning") and koro ("heart"). Other examples include proper nouns such as Ĉeĥio "Czech Republic" and Liĥtenŝtejno "Liechtenstein".
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H henry ; histidine ; hydrogen ; hyperopia. H / H / enthalpy. h hecto- ; hour. H The symbol for the element hydrogen. [more]H - Community and Resources

Noun
1. a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
(synonym) hydrogen, atomic number 1
(hypernym) chemical element, element
(hyponym) tritium
(substance-holonym) water, H2O
2. a unit of inductance in which an induced electromotive force of one volt is produced when the current is varied at the rate of one ampere per second
(synonym) henry
(hypernym) inductance unit
(part-meronym) abhenry
3. the 8th letter of the Roman alphabet
(hypernym) letter, letter of the alphabet, alphabetic character
(member-holonym) Roman alphabet, Latin alphabet
4. (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure; "enthalpy is the amount of energy in a system capable of doing mechanical work"
(synonym) heat content, total heat, enthalpy
(hypernym) physical property
(classification) thermodynamics

Noun
1. the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10\-34 joule-second
(synonym) Planck's constant
(hypernym) factor of proportionality, constant of proportionality

n. h, eighth letter of the English alphabet