Periods end declarative sentences and requests or mild commands.

Declarative: His name is Joshua.

Request or Mild Command: Please be sure to tell her I am coming.

Periods are used to end most abbreviations except for acronyms and abbreviations which are pronounced. See Abbreviations Contents for more information.

If a sentence ends with an abbreviation, no additional period is needed. If the sentence requires a question mark or exclamation point, one may be added after the period.

Incorrect: Please make the check out to Roland N. Payne, D.D.S..
(Second period at end not needed)

Correct: Please make the check out to Roland N. Payne, D.D.S.

Correct: Do I make the check out to Roland N. Payne, D.D.S.?

A period is used after numbers and letters in outlines.

Outline:

1. Punctuation
   1. Periods
      1. End sentences
      2. Abbreviations
      3. Outlines

A period always comes before a closing quotation mark.

Incorrect: George said, "I don't get it".

Correct: George said, "I don't get it."

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