S. Contractions that contain an apostrophe dont, shouldnt, shed never take a period except at the end of a sentence, of course. They are also not used in encyclopedia content except in quotations or titles of works, as noted below. Contractions that do not contain an apostrophe almost always take a period in North American English, but the point is optional in British English Doctor can be abbreviated Dr. American and Canadian English, but Dr. Dr in British English. If in doubt, or if the dot less usage could be confusing in the context, use the point. An exception is units of measurement, which never use periods see WP Manual of StyleDates and numbers. Expanded formseditDo not apply initial capitals or any other form of emphasis in a full term that is a common noun phrase, just because capitals are used in its abbreviation. Example use digital scanning DS, not Digital Scanning DS or digital scanning DS. AcronymseditAcronyms are abbreviations formed, usually, from the initial letters of words in a phrase. TerminologyeditAn initialism is usually formed from some or all of the initial letters of words in a phrase. An acronym is sometimes considered to be an initialism which is pronounced as a word e. NATO, as distinct from the case where the initialism is said as a string of individual letters e. UN for the United Nations a more precise term is word acronym, since acronym by itself is also frequently inclusive of initialisms. Herein, the term acronym applies collectively to initialisms, without distinction that an acronym is said as a word. Do not edit war over these terms. If using more precise terms like word acronym and initialism, please link to AcronymNomenclature, where they are explained for readers. Formation and usageeditCapitalisation Some acronyms are written with all capital letters, some with a mixture of capitals and lower case letters and some are written as common nouns e. Acronyms whose letters are pronounced individually which is what some call initialisms, for example FBI, EU are written in capitals. For more guidance on the capitalisation of acronyms, see Wikipedia Manual of StyleCapital lettersAcronyms. Spacing The letters of acronyms should not be spaced. 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. 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. Do not apply italics, boldfacing, underlining, or other highlighting to the letters in the expansion of an acronym that correspond to the letters in the acronym, as in BX Base Exchange. It is not necessary to state that an acronym is an acronym. Our readers should not be browbeaten with the obvious. If there is an article about the subject of an acronym e. NATO, then other articles referring to or using the acronym should use the same style capitalisation and punctuation that has been used within the main article. If no article exists for the subject acronym, then style should be resolved by considering consistent usage in source material. Unless specified in the Exceptions section below, an acronym should be written out in full the first time it is used on a page, followed by the abbreviation in parentheses, e. Millennium Development Goals MDGs. Common exceptions to this rule are post nominal initials because writing them out in full would cause clutter. Another exception is when something is most commonly known by its acronym i. CIA U. S. Central Intelligence Agency. To save space in small spaces defined above, acronyms do not need to be written out in full. When not written out in full on the first use on a page, an acronym should be linked. An unambiguous acronym can be linked as is, but an ambiguous acronym should be linked to its expansion. Upon later re use in a long article, the template abbr can be used to provide a mouse over tooltip giving the meaning of the acronym again without having to redundantly link it or spell it out again in the main text abbrCIAU. S. Central Intelligence Agency, giving CIA. K Lite Codec Pack 980 Full Exercises. For partial acronyms formed using the now rare convention of including whole short words in them, do not blindly normalise them to typical current style, but write each as found in the majority of modern reliable sources. Examples Commander in Chief is generally abbreviated Cin. C on its own, but may appear in all caps when used in a longer acronym especially a U. S. government one like CINCFLEET and CINCAIR. The Billiard Association of America was known as BA of A while this should not be written as unsourceable variations like BAof. A or BAA, the awkwardness of the abbreviation to modern eyes can be reduced by replacing the full width spaces with thin space characters BAthinspofthinspA or BA thinsp of thinsp A gives BA of A, which better groups the letters into a unit. ExceptionseditCountries and multinational unionseditFor these commonly referred to entities, the full name does not need to be written out in full on first use, nor provided on first use in parentheses after the full name if written out. Ship nameseditShip name prefixes like HMS and USS should not be written out in full. Time zoneseditAbbreviations for time zones e. GMT and UTC should not be written out in full in times. MiscellaneaeditAcronyms in this table do not need to be written out in full upon first use, except in their own articles or where not doing so would cause ambiguity. Acronym. Expansion. Notes. ADanno Domini in the year of our LordShould not be written out in full in dates and does not need to be linked. Do not use in the year of our Lord or any other translation of Anno Domini. AIDSacquired immunodeficiency syndromea. AKAalso known as.
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