I

Latin alphabet Aa Bb Cc Dd Ee Ff Gg Hh Ii Jj Kk Ll Mm Nn Oo Pp Qq Rr Ss Tt Uu Vv Ww Xx Yy Zz

Due to MediaWiki's uppercase algorithm, ı (lower case dotless i) will bring you here.

I is the ninth letter in the Latin alphabet.

History

The letter I derived from the Greek iota (Ι, ι). It stood for the vowel /i/, the same as in the Old Italic alphabet. In Latin (as in Modern Greek) /j/ (as English Y in YOKE) was added. In Semitic, /j/ was the usual sound value of Jôd (probably originally a pictogram for an arm with hand), /i/ only in foreign words.

In English, I represents different sounds, among them a diphthong that developed from /i:/ as well as short, open /I/ as in BILL. The dot over the lowercase 'i' is called a tittle. In the Turkish alphabet, dotted and dotless I are considered separate letters and both have uppercase (I, İ) and lowercase (ı, i) forms.

Alternative representations

India represents the letter I in the NATO phonetic alphabet.

In international Morse code the letter I is DitDit: · ·

In Braille the letter I is represented as ⠊ (in Unicode), the dot pattern,

. 
 .
..

Computing

In Unicode the capital I is codepoint U+0049 and the lowercase i is U+0069.

The ASCII code for capital I is 73 and for lowercase i is 105; or in binary 01001001 and 01101001, correspondingly.

The EBCDIC code for capital I is 201 and for lowercase i is 137.

The numeric character references in HTML and XML are "I" and "i" for upper and lower case respectively.

Meanings for I

• In biochemistry, I is the symbol for isoleucine.
• In chemistry, I is the symbol for iodine.
• In computing, <i> is the deprecated HTML tag for marking italic type. It is also commonly used as the name of the index variable in for loops when no other name suggests itself.
• In English, I is the nominative case of the pronoun denoting the first person, singular. See Wiktionary:I.
• In international licence plate codes, I stands for Italy.
• In mathematics,
  • i denotes the imaginary unit, a complex number whose square is equal to −1.
  • I denotes the closed unit interval, which contains all real numbers from 0 to 1, inclusive
  • I denotes the identity matrix.
  • i is commonly used as an index variable to coordinate vectors or matrices. It is written as a subscript after the indexed element. When used with matrices, it usually indexes rows, in which case columns are usually indexed by j.
• In physics and electronic engineering, I is often the variable for electric current. Sometimes both I and i are used for static and small signal respecively. Therefore the imaginary unit is represented by j instead.
• In radiocommunication, I is the ITU prefix allocated to Italy.
• In Roman numerals, I denotes the number 1 (there are also separate Unicode characters for this number, 0x2160 "Ⅰ" and 0x2170 "ⅰ").
• In structural engineering I is used for the moment of inertia
• In music,
  • the Roman numeral I is the tonic scale degree, chord, or diatonic function, when distinguished I = major and i = minor.
  • I is the name of the winner of the Norwegian version of Pop Idol and also World Idol, Kurt Nilsen's debut album. See I (album).
  • i is the name of the most recent album by The Magnetic Fields.
  • i is the name of a Portuguese post-rock band
  • I is the name of a song and EP by Swedish Tech metal band, Meshuggah.
• In economics, I is usually used to represent investment.
• In television, i is the television network formerly known as PAX

See also

Ì, Í, Î, Ï, Ĭ, İ