I vs p

I

• The ninth letter of the English alphabet, called i and written in the Latin script. 

• Interstate. 

• The ego. 

• The speaker or writer, referred to as the grammatical subject, of a sentence. 

• The speaker or writer, referred to as the grammatical object, of a sentence. 

p

• The sixteenth letter of the English alphabet, called pee and written in the Latin script. 

• proton