NodeWorks - Category Description for Encyclopedia

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.

Alternate 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,
.X X. ..

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 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 a pronoun denoting the first person, singular.

In international licence plate codes, I stands for Italy.

In mathematics,

* i denotes the imaginary unit, a complex number whose square is -1.

* I denotes the closed unit interval, which contains all real numbers from 0 to 1, inclusive

* I denotes the identity matrix.

In physics and electronic engineering, I is often the variable for electric current. 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.

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).

In economics, I is usually used to represent investment.

I

History

Alternate representations

Computing

Meanings for I

See also