I (/aɪ/, lower case i) is the 9th letter of the Latin alphabet, as used in English, and the 3rd vowel letter.
It is also in English a word in itself, that is the first person singular subject pronoun.
French-speaking learners may confuse this with E because in French the letter I is pronounced /i:/.
i can also be used to represent language level algebraically - see i (representation of language level).
You may refer to the following articles