1. The ninth letter in the latin
alphabet, I comes from the Greek
Ι or
ι (Iôta) stood for the vowel /i/, the same in Etruscan, 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.
2. The pronoun
? that is used in the
English language by a person to refer to himself or herself.
3. In
chemistry, I is the [atomic symbol]
? for
Iodine.
4. In
mathematics, the letter
i is used for the
imaginary unit, a
complex number whose square is -1.
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