What does it stand for?

What is e.g.?
An abbreviation for "exempli gratia,"Latin for "for example."

What is n.b.?
abbreviation for nota bene: used to mark something as particularly important.

What is i.e.?
abbreviation for "id est," Latin for "that is"; also means, "in other words." it is followed by an explanation, specific list or a paraphrase.