This is a great chart for different grammar students may come upon when writing or editing/revising. (Makes a great anchor chart as well). I picked this chart because it is clear cut, easy to read, and would catch students' eyes if I were to color it up.
They actually both come from Latin: i. stands for id est and means roughly "that is"; stands for exempli gratia, which means “for example”. But this graphic's explanation is a bit easier to remember than the Latin definitions.