What is I?

I definition and meaning on Dictionary terms:
noun, plural I’s or Is, i’s or is.
the ninth letter of the English alphabet, a vowel.
any spoken sound represented by the letter I or i, as in big, nice, or ski.
something having the shape of an I.
a written or printed representation of the letter I or i.
a device, as a printer’s type, for reproducing the letter I ori.


reference: https://www.dictionary.com/browse/i