FULL STOP OR PERIOD  1. It represents the longest pause. It is used at the end of each assertive and imperative sentence. I write a letter. (assertive) Please, post this letter. (imperative) A full stop indicates that the idea expressed in the sentence is complete and does not go further. 2. To mark abbreviations and initials, as, (B.A., LL.B., M.P., M.A., M.B.B.S., Dr. R.P. Sharma, Mr. L.L. Chauhan) (a) It requires a comma after an abbreviation.