I is the ninth letter of the Latin alphabet. I or i may also refer to:

Language

I (pronoun) In Modern English, ''I'' is the singular, first-person pronoun. Morphology In Standard Modern English, ''I'' has five distinct word forms: * ''I'': the nominative (subjective) form **''I'' is the only pronoun form that is always capitalize ...

, the first-person singular subject pronoun in English * I (Cyrillic), a letter used in almost all ancient and modern Cyrillic alphabets * ı, dotless I, letter used in Turkish and Azerbaijani * i, close front unrounded vowel, in the International Phonetic Alphabet * ɨ, close central unrounded vowel, in the International Phonetic Alphabet * ɪ, near-close near-front unrounded vowel, in the International Phonetic Alphabet *

I (kana) I (い in hiragana or イ in katakana) is one of the Japanese kana each of which represents one mora. い is based on the sōsho style of the kanji character 以, and イ is from the radical (left part) of the kanji character 伊. In the modern ...

, one of the Japanese kana that each represent one mora * I, male prefix to some

Balinese name A Balinese name is part of a system of identification used by the Balinese people and in the western parts of the neighboring island of Lombok, Indonesia. A Balinese name will have three parts: a title, a birth order name and a personal name. Balin ...

Science, technology, and mathematics

Biology

* Troponin I, one of the three troponins * Haplogroup I (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup * Haplogroup I (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup *

Olfactory nerve The olfactory nerve, also known as the first cranial nerve, cranial nerve I, or simply CN I, is a cranial nerve that contains sensory nerve fibers relating to the sense of smell. The afferent nerve fibers of the olfactory receptor neurons tr ...

, the 1st cranial nerve in human anatomy * the Lợn Ỉ or

Vietnamese Pot-bellied Vietnamese Pot-bellied is the exonym for the Lon I ( vi, Lợn Ỉ, italic=no) or I pig, an endangered traditional Vietnamese breed of small domestic pig. The I is uniformly black and has short legs and a low-hanging belly, from which the name d ...

pig

Chemistry

Iodine Iodine is a chemical element with the symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at , and boils to a vi ...

, symbol I, a chemical element * I,

isoleucine Isoleucine (symbol Ile or I) is an α-amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated −NH form under biological conditions), an α-carboxylic acid group (which is in the deprot ...

, an amino acid * I,

ionic strength The ionic strength of a solution is a measure of the concentration of ions in that solution. Ionic compounds, when dissolved in water, dissociate into ions. The total electrolyte concentration in solution will affect important properties such as ...

in a chemical solution * , Van 't Hoff factor

Computing

* i, a common generic index variable often used in

program loops In computer science, control flow (or flow of control) is the order in which individual statements, instructions or function calls of an imperative program are executed or evaluated. The emphasis on explicit control flow distinguishes an ''imper ...

* <i>, an

HTML element An HTML element is a type of HTML (HyperText Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment nodes and others). The first used version of HTML was written by Tim Berners-Lee in 1993 ...

for marking italic type * .i, the common filename extension for a file that contains the output from a preprocessor * i-, a prefix for Apple products e.g. iMac, iPod, iPhone * i-, an

Internet-related prefix Internet-related prefixes such as '' e-'', '' i-'', '' cyber-'', ''info-'', '' techno-'' and ''net-'' are added to a wide range of existing words to describe new, Internet- or computer-related flavors of existing concepts, often electronic produc ...

used by Internet and electronic companies

Mathematics

* I, the Roman numeral for 1 * , imaginary unit, for which * or ,

identity matrix In linear algebra, the identity matrix of size n is the n\times n square matrix with ones on the main diagonal and zeros elsewhere. Terminology and notation The identity matrix is often denoted by I_n, or simply by I if the size is immaterial o ...

of indeterminate size (or of size ) * , unit interval, which contains all real numbers from 0 to 1 inclusive * , an index variable, e. g. in a

matrix Matrix most commonly refers to: * ''The Matrix'' (franchise), an American media franchise ** '' The Matrix'', a 1999 science-fiction action film ** "The Matrix", a fictional setting, a virtual reality environment, within ''The Matrix'' (franchi ...

or for

summation In mathematics, summation is the addition of a sequence of any kind of numbers, called ''addends'' or ''summands''; the result is their ''sum'' or ''total''. Beside numbers, other types of values can be summed as well: functions, vectors, mat ...

* , the

regularized incomplete beta function In mathematics, the beta function, also called the Euler integral of the first kind, is a special function that is closely related to the gamma function and to binomial coefficients. It is defined by the integral : \Beta(z_1,z_2) = \int_0^1 t^(1 ...

(of a variable and parameters ) * , the unit vector along the ''x''-axis in Cartesian coordinates

Physics and astronomy

* , ,

electric current An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume. The moving pa ...

* , isospin * , luminous intensity * ,

moment of inertia The moment of inertia, otherwise known as the mass moment of inertia, angular mass, second moment of mass, or most accurately, rotational inertia, of a rigid body is a quantity that determines the torque needed for a desired angular acceler ...

* , orbital inclination * I (Roman number one), in the Yerkes spectral classification scheme, the symbol for supergiants

Telecommunication

* I band (NATO), the range of radio frequencies from 8 GHz to 10 GHz in the electromagnetic spectrum * I, the ITU prefix allocated to Italy in radio communication * I, in QAM modulation schemes, the in-phase communications channel

Other uses in technology

* i, a suffix unit for video resolution (vertical Interlaced lines), as in 480i or 1080i * ''I'', in the YIQ colorspace commonly used with the NTSC television encoding scheme, the color-difference channel which is in-phase with the subcarrier

Arts and media

Music

* I (band), a Norwegian heavy metal band * I, a

diatonic function In music, function (also referred to as harmonic function) is a term used to denote the relationship of a chord"Function", unsigned article, ''Grove Music Online'', . or a scale degree to a tonal centre. Two main theories of tonal functions ex ...

in tonal music theory

Albums

* ''i'' (A.R. Kane album), 1989 * ''I'' (Ben Lester album), 2019 * ''I'' (Cilvaringz album), 2007 * ''I'' (Cursed album), 2003 * ''I'' (Die Krupps album), 1992 * ''I'' (Felix Jaehn album), 2018 * ''I'' (Ikimono-gakari album), 2013 * ''I'' (Jaejoong EP), 2013 * ''I'' (JonnyX and the Groadies album), 2005 * ''I'' (Juju album), 2018 * ''I'' (Kingston Wall album), 1992 * ''I'' (Kurt Nilsen album), 2003 * ''i'' (The Magnetic Fields album), 2004 * ''I'' (Meshuggah EP), 2004 * ''i'' (Misako Odani album), 1997 * ''I'' (Nightingale album), 2000 * ''I'' (Petbrick album), 2019 * ''I'' (Sahg album), 2006 * ''I'' (Taeyeon EP), 2015 * ''I'' (Xerath album), 2009 * ''I'' (soundtrack), by A. R. Rahman from the eponymous 2015 film

Songs

* "i" (Kendrick Lamar song), a 2014 song by Kendrick Lamar from his album ''To Pimp a Butterfly'' * "i" (Lil Skies song), a song 2019 by Lil Skies from his debut album ''Shelby'' * "I" (Taproot song), a 2001 song by band Taproot from their album ''Gift'' * " I (Who Have Nothing)", a 1966 Ben. E. King song also recorded by Tom Jones, who used the title for one of his albums * "I", a 2003 song on '' Weather Systems'', an album by Andrew Bird * "I", a 1992 song on '' Selected Ambient Works 85–92'', an album by Aphex Twin * "I", a 1992 song on '' Dehumanizer'', an album by Black Sabbath * "I", a 1997 song on '' Coal Chamber'', an album by Coal Chamber * "I", a 1967 song on '' Underground'', an album by The Electric Prunes * "I", a 2012 song on '' Muse'', an album by Jolin Tsai * "I", a 1981 song on '' Music from "The Elder"'', an album by Kiss * "I", a 1994 song on '' Made in USA'', an album by Pizzicato Five * "I", a 1999 song on '' Eternal'', an album by Samael * "I", a 2003 song on '' Winter Story'', an album by Shinhwa * "I", a 2015 song on '' I'', an EP by Taeyeon * "I", a 2016 song by Rezz * "I", a 2019 song by Hey! Say! JUMP

Other media

* ''I'' (2015 film), an Indian Tamil-language film * ''I'' (2016 film), an Iranian film *

i (TV network) Ion Television is an American broadcast television network owned by the Katz Broadcasting subsidiary of the E. W. Scripps Company. The network first began broadcasting on August 31, 1998, as Pax TV, focusing primarily on family-oriented enter ...

, the former name of ION Television * ''i'' (newspaper), a British newspaper based in London * ''i'' (Portuguese newspaper), a Portuguese newspaper based in Lisbon * I, a character in the comic book series '' Adventure into Fear'' * ''

"I" Is for Innocent ''"I" Is for Innocent'' is the ninth novel in Sue Grafton's "Alphabet" series of mystery novels and features Kinsey Millhone Kinsey Millhone is a fictional character created by the American author Sue Grafton (1940–2017) for her "alphabet mys ...

'', the ninth novel in Sue Grafton's "Alphabet mystery" series, published in 1992 * '' I, a Man'', a 1967 Andy Warhol film

Mythology

Goddess I Goddess I is the Taube's Schellhas-Zimmermann letter designation for one of the most important Maya deities: a youthful woman to whom considerable parts of the post-Classic codices are dedicated, and who equally figures in Classic Period scenes. B ...

, a Mayan deity *

Hou-i Hou Yi () is a mythological Chinese archer. He was also known as Shen Yi and simply as Yi (). He is also typically given the title of "Lord Archer". He is sometimes portrayed as a god of archery descended from heaven to aid mankind. Other times ...

, or I, a heroic archer and hunter in Chinese mythology

Vehicles

* Italy (I), in the list of international vehicle registration codes * Italy ( aircraft registration prefix) * Mitsubishi i, a Japanese kei car

Other uses

* i, an international symbol for visitor or tourist information; see

ISO 7001 ISO 7001 ("public information symbols") is a standard published by the International Organization for Standardization that defines a set of pictograms and symbols for public information. The latest version, ISO 7001:2007, was published in Novembe ...

* Nintendo DSi, the third model in the Nintendo DS line, released in 2008 * Nintendo DSi XL, the larger version of the DSi, released in 2009 * I, an alternative romanization of

Lee (Korean surname) Lee, Revised Romanization of Korean, I, or Yi () is the List of South Korean surnames by prevalence, second-most-common surname in Korea, behind Kim (Korean surname), Kim (김). Historically, 李 was officially written as Ni () in Korea. The ...

I-Foundation Avanti Schools Trust is the sponsor of state-funded Hindu faith schools in the United Kingdom. The I-Foundation is a Hindu and ISKCON charity in England and Wales that is the religious authority governing schools run by the Avanti Schools Trust. ...

, a charity in charge of state-funded Hindu faith schools in the United Kingdom * Interest rate (i), in economics *

Investment Investment is the dedication of money to purchase of an asset to attain an increase in value over a period of time. Investment requires a sacrifice of some present asset, such as time, money, or effort. In finance, the purpose of investing i ...

(I), in economics * India, the military time zone code for UTC+09:00