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No, when using "OD" at the end of a sentence, you only need one period as the abbreviation already ends with a period. So it would be "O.D." with one period.
No, you do not need to add an additional period if "etc." is within parentheses at the end of a sentence. The period that ends the abbreviation "etc." also serves as the sentence-ending punctuation.
Et cetera is abbreviated to etc. No second period is needed but you will sometimes find one anyway.
Indifference
One.
Yes, "period" is a two-syllable word.
If a sentence ends with an abbreviated word then only one period (full stop) is used.
A conversation-stopper, or a show-stopper.
Well if you want to end the sentence, you would put ONLY one period. Example: I am watching T.V. you only put one period. If the word TV is in the middle of the sentence, you still do the same Example: I am watching T.V. with my mother today.
One word.
One period. The period in etc. also functions as the period for the end of the sentence.
No. You put only one period.