I (disambiguation)

{{wiktionary|I|i|i-|-i}} '''I''' is the ninth letter of the Latin alphabet.

'''I''' or '''i''' may also refer to: {{TOC right}} ==Language== * I (pronoun), the first-person singular subject pronoun in English * ı, dotless I (lowercase), Latin letter used in Turkish and Azerbaijani * İ (uppercase), dotted I, used in the Latin-script alphabets of Azerbaijani, Crimean Tatar, Gagauz, Kazakh, Tatar, and Turkish * I (Cyrillic) (И и), a letter used in almost all ancient and modern Cyrillic alphabets * Dotted I (Cyrillic) (І і), used in the orthographies of Belarusian (in replacement of Cyrillic И), Kazakh, Khakas, Komi, Carpathian Rusyn and Ukrainian * Iota, the letter in the Greek alphabet, uppercase {{serif|{{char|Ι}}}}, lowercase {{serif|{{char|ι}}}} * I (kana), one of the Japanese kana that each represent one mora * I, male prefix to some Balinese names * In the International Phonetic Alphabet ** i, close front unrounded vowel ** ɨ, close central unrounded vowel ** ɪ, near-close near-front unrounded vowel

==Science, technology, and mathematics== {{for|vehicles|#Vehicles and transportation}} ===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 1st cranial nerve in human anatomy * the Lợn Ỉ or Vietnamese Pot-bellied pig

===Chemistry=== * Iodine, symbol I, a chemical element * I, isoleucine, an amino acid * I, ionic strength in a chemical solution * {{mvar|i}}, Van 't Hoff factor

===Computing=== * <code>i</code>, a common generic index variable often used in program loops * <code></code>, an HTML element for marking italic type * <code>.i</code>, the common filename extension for a file that contains the output from a preprocessor * i-, a prefix for Apple products and services e.g. iMac, iPod, iPhone, iCloud * i-, an Internet-related prefix used by Internet and electronic companies * Palochka, the number {{keypress|1}} on Cyrillic keyboards that uses the glyph {{serif|{{char|I}}}} as its typeset form.

===Mathematics=== * I, the Roman numeral for 1 * {{mvar|i}}, imaginary unit, for which {{math|1=''i''2 = −1}} * {{mvar|I}} or {{math|''I''''n''}}, identity matrix of indeterminate size (or of size {{mvar|n}}) * {{mvar|I}}, unit interval, which contains all real numbers from 0 to 1 inclusive * {{mvar|i}}, an index variable, e. g. in a matrix or for summation * {{math|''I''''x''(''a'',''b'')}}, the regularized incomplete beta function (of a variable {{mvar|x}} and parameters {{math|''a'',''b''}}) * {{mvar|î}}, the unit vector along the ''x''-axis in Cartesian coordinates

===Physics and astronomy=== * {{mvar|I}}, {{mvar|i}}, electric current * {{mvar|I}}, isospin * {{mvar|I}}, luminous intensity * {{mvar|I}}, moment of inertia * {{mvar|i}}, 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 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 (Imminence album), 2014 * ''I'' (Jaejoong EP), 2013 * ''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'' (Sahg album), 2006 * ''I'' (Taeyeon EP), 2015 * ''I'' (Xerath album), 2009 * ''I'' (soundtrack), by A. R. Rahman from the eponymous 2015 film * ''I.'', a 2012 EP by Cigarettes After Sex

====Songs==== * "I" (Kendrick Lamar song), 2014 * "I" (Lil Skies song), 2019 * "I" (Taproot song), 2001 * "I" (Taeyeon song), 2015 * "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 2008 song on ''In the Shadow of a Thousand Suns'', an album by Abigail Williams * "I", a 2011 song on ''Cinderella's Eyes'', an album by Nicola Roberts * "I", a 2016 song by Rezz * "I", a 2019 song by Hey! Say! JUMP

===Television and radio=== * Channel i (Singaporean TV channel), a defunct Singaporean television channel * i (TV network), the former name of ION Television * Radio i, originally Radio International, the former name of New Zealand radio station Mix (radio station) * Radio-i, the brand name of Aichi International Broadcasting, a defunct radio station in Aichi Prefecture, Japan * TVRi, a Romanian television channel

===Other media=== * ''I'' (2015 film), an Indian Tamil-language film * ''I'' (2016 film), an Iranian film * ''The i Paper'', a British newspaper, formerly known as ''i'' * ''i'' (Portuguese newspaper), a Portuguese newspaper based in Lisbon * I, a character in the comic book series ''Adventure into Fear'' * ''"I" Is for Innocent'', the ninth novel in Sue Grafton's "Alphabet mystery" series, published in 1992 * ''I, a Man'', a 1967 Andy Warhol film

==Mythology== * Goddess I, a Mayan deity * Hou-i, or I, a heroic archer and hunter in Chinese mythology

==Vehicles and transportation== * Italy (I), in the list of international vehicle registration codes * Italy (aircraft registration prefix) * Mitsubishi i, a Japanese kei car * I (Los Angeles Railway), a former streetcar line in Los Angeles * Toei Mita Line, a subway service operated by the Tokyo Metropolitan Bureau of Transportation (Toei), labeled 17px|I * Imazatosuji Line, a subway service operated by the Osaka Metro, labeled 17px|I * 17px|I, the official West Japan Railway Company service symbol for the Kakogawa Line

==Other uses== * i, an international symbol for visitor or tourist information; see ISO 7001 * 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) * I-Foundation, a charity in charge of state-funded Hindu faith schools in the United Kingdom * Interest rate (i), in economics * India, the military time zone code for UTC+09:00 * ''I Ching'', or ''Yijing'', ancient Chinese text

==See also== {{canned search|i}} * 1 (disambiguation) * l (disambiguation) * Eye (disambiguation) * Self * {{srt}}