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Plurals: Plural acronyms are written with a lower-case s after the abbreviation, without an apostrophe, unless full points are used between the letters (e.g. ABCs or A.B.C.'s). Note that Wikipedia generally avoids using full point in upper-case acronyms. Emphasis: Do not apply special style, such as SMALL CAPS, to acronyms.
In longer abbreviations that incorporate the country's initials (USN, USAF), never use periods. When the United States is mentioned with one or more other countries in the same sentence, US (or U.S. ) may be too informal, especially at the first mention or as a noun instead of an adjective ( France and the United States , not France and the US ).
Because the difference between a name with spaces between periods and initials, and one lacking these spaces, can not be used as single difference in a disambiguation logic appropriate redirects must be created (e.g. also if C. P. E. Bach exists as a redirect to a page with the given names not abbreviated, also C.P.E. Bach must exist and must ...
To avoid unnecessary periods in abbreviations, Chicago recommends the following general guidelines: use periods with abbreviations that appear in lowercase letters; use no periods with abbreviations that appear in full capitals or small capitals, whether two letters or more. For feasible exceptions, see 15.5.
It may be placed after an initial letter used to abbreviate a word. It is often placed after each individual letter in acronyms and initialisms (e.g., "U.S."). However, the use of full stops after letters in an initialism or acronym is declining, and many of these without punctuation have become accepted norms (e.g., "UK" and "NATO").
A doubled letter appears in abbreviations of some Welsh names, as in Welsh the double "l" is a separate sound: "Ll. George" for (British prime minister) David Lloyd George. Some titles, such as "Reverend" and "Honourable", are spelt out when preceded by "the", rather than as "Rev." or "Hon." respectively.
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On Wikipedia, most acronyms are written in all capital letters (such as NATO, BBC, and JPEG).Wikipedia does not follow the practice of distinguishing between acronyms and initialisms; unless that is their common name, do not write word acronyms, that are pronounced as if they were words, with an initial capital letter only, e.g., do not write UNESCO as Unesco, or NASA as Nasa.