e.g. / i.e.: meaning and punctuation

E.g. abbreviates Latin exempli gratia and means for example: what follows it is a sample from a larger set, as in a citrus fruit (e.g., a lemon). I.e. abbreviates id est and means that is: what follows it restates or fully specifies what precedes it, as in the committee chair (i.e., Lee Park). If what follows is one possibility among others, use e.g.; if it is the only thing meant, use i.e. Do not end an e.g. series with etc., because e.g. already marks it as incomplete. Set both abbreviations lowercase, with periods, in roman type. In American usage a comma follows each, and a comma, a dash, or an opening parenthesis comes before it. Use the abbreviations inside parentheses and in notes, tables, and captions; in running text, write for example and that is. Never open a sentence with either abbreviation. In speech, say for example and that is, or say the letters.