General Question

flo's avatar

When do you use a period between the letters in an abbreviation?

Asked by flo (11201points) 2 weeks ago

I don’t mean what we see but what is the reasoning as to when there should be a period and when not? For eg. is it U.S or US?

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3 Answers

zenvelo's avatar

One places a period at the end or each letter (for initialized abbreviations) , i.e.,, U.S.

If the abbreviation is the shortening of a longer word, one places it at the end, i.e., apt. for apartment., or appt. for appointment.

Zaku's avatar

U.S.A. is a correct abbreviation for the United States of America.
USA is a correct abbreviation for U,S.A..

Using periods is more formal and/or old-fashioned, but perhaps more correct or at least more specific.

flo's avatar

Understood.

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