The period, also known as the full stop, is the standard punctuation mark used in English and most Western languages to indicate the end of a sentence.
In mathematics it’s used (depending on which country you come from) either to indicate a decimal point or to separate sequences of three digits.
Three periods equal an ellipsis. Two periods equal a lazy ellipsis. One period per month equals the menstrual cycle, the onset of which is called menarche and typically occurs in women age 12 or 13.
In the English language the word “period” is used in speech when nothing more needs to be said about the topic; e.g., “If you wanted to pause you should have used a comma, period!”
The Russian short story writer Isaac Babel once wrote: “No iron can pierce the human heart with such force as a full stop put in the right place.”
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