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I (disambiguation)

Last updated January 23, 2026

I is the ninth letter of the Latin alphabet.

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 Ι, lowercase 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
- ɨ, close central unrounded vowel
- ɪ, near-close near-front unrounded vowel

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 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
$i$ , Van 't Hoff factor

Computing

i, a common generic index variable often used in program loops
<i>, an HTML element 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 and services e.g. iMac, iPod, iPhone, iCloud
i-, an Internet-related prefix used by Internet and electronic companies
Palochka, the number 1 on Cyrillic keyboards that uses the glyph I as its typeset form.

Mathematics

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

Physics and astronomy

$I$ , $i$ , electric current
$I$ , isospin
$I$ , luminous intensity
$I$ , moment of inertia
$i$ , 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), 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" (Taeyeon song), a 2015 song from the EP I by Taeyeon
"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
Imazatosuji Line, a subway service operated by the Osaka Metro, labeled
, 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
Investment (I), in economics
India, the military time zone code for UTC+09:00
I Ching , or Yijing, ancient Chinese text

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I (disambiguation)

Contents

Language

Science, technology, and mathematics

Biology

Chemistry

Computing

Mathematics

Physics and astronomy

Telecommunication

Other uses in technology

Arts and media

Music

Albums

Songs

Television and radio

Other media

Mythology

Vehicles and transportation

Other uses

See also