I
I is the ninth letter in the Latin alphabet, derived from the Greek iota (Ι, ι). It stood for the vowel /i/, the same as in the Etruscan 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 fro/ as well as short, open / as in BILL. The dot over the lowercase 'i' is called a tittle.
In the NATO phonetic alphabet I is represented by India, or more rarely, Indigo.
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
In context, I is also:
- A word: the pronoun "I" that is used in the English language by a person to refer to himself or herself.
- In chemistry, a symbol for the chemical element iodine.
- In mathematics, the letter i is used for the imaginary unit, a complex number whose square is -1.
- In physics, the variable I for current. The imaginary unit is represented by j instead.
- A symbol (I) for the closed unit interval, that is all real numbers from 0 to 1 inclusive, and also for the identity matrix.
- The Roman numeral for one, whether uppercase or lowercase.
- A Swedish film made in 1966, see I.
- In the Turkish alphabet, "I" and "i" are different letters.
