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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).
Short caption – Infoboxes for things that change over time can mention the year of the image briefly, e.g. "Cosby in 2010" for . If the image is of a person doing that for which they are known at an otherwise common event, the correct verb delivers the message, e.g. "Jackson performing in 1988" for Michael Jackson .
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.
A non-empty scheme component followed by a colon (:), consisting of a sequence of characters beginning with a letter and followed by any combination of letters, digits, plus (+), period (.), or hyphen (-). Although schemes are case-insensitive, the canonical form is lowercase and documents that specify schemes must do so with lowercase letters.
The effect of following a hyperlink may vary with the hypertext system and may sometimes depend on the link itself; for instance, on the World Wide Web most hyperlinks cause the target document to replace the document being displayed, but some are marked to cause the target document to open in a new window (or, perhaps, in a new tab). [2]
Generally acronyms and initialisms are capitalized, e.g., "NASA" or "SOS". Sometimes, a minor word such as a preposition is not capitalized within the acronym, such as "WoW" for "World of Warcraft". In some British English style guides, only the initial letter of an acronym is capitalized if the acronym is read as a word, e.g., "Nasa" or ...