People are often uncertain about whether or not to use full stops in abbreviations. Here are some guidelines:
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1. In both British and American English, if you are using initial (i.e. first) letters to represent words, you don’t normally need to put a full stop after them:
BBC(British Broadcasting Corporation)
CNN(Cable News Network)
UK(the United Kingdom)
NATO(the North Atlantic Treaty Organization)
IAEA(International Atomic Energy Agency)
2. In American English, however, it is common to use a full stop as an alternative style for certain abbreviations, in particular:
USA or U.S.A.
US or U.S.
3. If an abbreviation consists of the first and last letters of a word, you don’t need to use a full stop at the end:
Mr(Mister)
Dr(Doctor)
4. If the abbreviation consists only of the first part of a word, then you should put a full stop at the end:
Wed. (Wednesday)
Dec. (December)
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