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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"). [b]
A period (a.k.a. full stop) is sometimes used to signify abbreviation, but opinion is divided as to when and if this convention is best practice. According to Hart's Rules, a word shortened by dropping letters from the end terminates with a period, whereas a word shorted by dropping letters from the middle does not.
A shortening is an abbreviation formed by removing at least the last letter of a word (e.g. etc. and rhino), and sometimes also containing letters not present in the full form (e.g. bike). As a general rule, use a full point after a shortening that only exists in writing (e.g. etc.) but not for a shortening that is used in speech (e.g. rhino).
Captions normally start with a capital letter. The text of captions should not be specially formatted (with italics, for example), except in ways that would apply if it occurred in the main text. Several discussions (e.g. this one ) have failed to reach a consensus on whether "stage directions" such as (right) or (behind podium) should be in ...
"How many spaces should I leave after a period or other concluding mark of punctuation?". Modern Language Association. Archived from the original on 12 October 2006; Rhodes, John S. (13 May 1999). "One Versus Two Spaces After a Period". WebWord.com. Archived from the original on 9 March 2010; The Times (2010).
Acronyms are often spelled with the initial letter of each word in all caps with no punctuation. For some, an initialism [ 1 ] or alphabetism , connotes this general meaning, and an acronym is a subset with a narrower definition: an initialism pronounced as a word rather than as a sequence of letters.
The relative size of the sentence spacing would vary depending on the size of the word spaces and the justification needs. [17] For most countries, this remained the standard for published work until the 20th century. [18] Yet, even in this period, there were publishing houses that used a standard word space between sentences. [7]
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.