I has 12 different meanings across 6 categories:
a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)
The name of the Latin-script letter I .
The ego.
Interstate.
The ninth letter of the English alphabet, called i and written in the Latin script.
The ordinal number ninth, derived from this letter of the English alphabet, called i and written in the Latin script.
Nonstandard spelling of I.
The speaker or writer, referred to as the grammatical subject, of a sentence.
Obsolete spelling of aye.