I (disambiguation)

I is the ninth letter of the Latin alphabet.

I or i can also refer to:

Language

1 Language
2 Vowels
3 Anatomy
4 Mathematics
5 Physics
6 Astronomy
7 Chemistry
8 Genetics
9 Economics
10 Computers
11 Music
- 11.1 Albums
- 11.2 Songs
12 Media
13 Individuals
14 Vehicles

I (pronoun), the first-person singular subject pronoun in English

Vowels

the Close front unrounded vowel in the International Phonetic Alphabet and many other Latin-based orthographies
/i/, /ɨ/ and /ɪ/, in the International Phonetic Alphabet, three vowels represented by variations of the letter I
I (kana), one of the Japanese kana that each represent one mora

Anatomy

Olfactory nerve, 1st cranial nerve

Mathematics

I, 1 (number) in Roman numerals
i, the imaginary unit for which i² = -1 (see also imaginary number)
I (or I_n), an identity matrix of indeterminate size (or of size n)
i, an index variable in a matrix
I_x(a,b), the regularized incomplete beta function (of a variable x and parameters a,b)
I, the closed unit interval which contains all real numbers from 0 to 1 inclusive
${\hat{\imath}}$ (pronounced "i-hat"), the unit vector along the x-axis in Cartesian coordinates

Physics

I and i, symbols for electric current signals in electronic engineering
I, the moment of inertia
I, symbol for the luminous intensity
i, symbol for the van't Hoff factor or coefficient

Astronomy

i, the symbol for orbital inclination
I, in the Yerkes spectral classification scheme the symbol for supergiants

Chemistry

I, the symbol for iodine on the periodic table
I, the symbol for isoleucine in biochemistry

Genetics

Haplogroup I (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
Haplogroup I (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup

Economics

i, the symbol for the interest rate
I, the symbol for investment

Computers

i, a common generic index variable often used for looping constructs
<i>, an HTML element for marking italic type
.i, the common filename extension for a file that contains the output from a preprocessor.
IBM i is a computer operating system
Many Apple products are known by i[Blank], e.g. iMac, iPod, iPhone.
Lowercase i prefix, a common prefix used by Internet and electronic companies

Music

I, a diatonic function in tonal music theory
I (band), a band formed by members of Immortal, Enslaved, Gorgoroth, and Sahg

Albums

Songs

"I" (Aphex Twin song)
"I", a song on Dehumanizer, an album by Black Sabbath
"I", a song on Weather Systems, an album by Andrew Bird
"I", a song on Coal Chamber, an album by Coal Chamber
"I", a song on Music from "The Elder", an album by KISS
"I", a song on Eternal, an album by Samael
"I (Who Have Nothing)", a Ben. E. King song also recorded by Tom Jones, who used the title for one of his albums

Media

i, a suffix unit for video resolution (vertical Interlaced lines), as in 480i or 1080i
i (TV network), the former name of ION Television
I band, 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
I, in the YIQ colorspace commonly used with the NTSC television encoding scheme, the color-difference channel which is in-phase with the subcarrier
i (newspaper), a British newspaper.
i, in lower case on a blue field, the international symbol for visitor or tourist information; (see ISO 7001)

Individuals

I, a character in Adventure into Fear who acted as a guide for Morbius, the Living Vampire
Goddess I, a Mayan deity

Vehicles

I, the symbol for Italy in the list of international license plate codes
I, the registration prefix for Italy in aircraft registrations
Mitsubishi i, a Japanese kei car

Latin letter disambiguation
A • B • C • D • E • F • G • H • I • J • K • L • M • N • O • P • Q • R • S • T • U • V • W • X • Y • Z

This disambiguation page lists articles associated with the same Latin letter.
If an internal link led you here, you may wish to change the link to point directly to the intended article.