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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 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).
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.
The first letter of every word in such a name is capitalized (Alpha Centauri and not Alpha centauri; Milky Way, not Milky way). Words such as comet and galaxy should be capitalized when they form part of a proper name, but not when they are used as a generic term ( Halley's Comet is the most famous of the comets ; The Andromeda Galaxy is a ...
The first cell in each row gives a symbol; The second is a link to the article that details that symbol, using its Unicode standard name or common alias. (Holding the mouse pointer on the hyperlink will pop up a summary of the symbol's function.);
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 ...
A historiated initial (the letter O) from an illuminated manuscript. In a written or published work, an initial [a] is a letter at the beginning of a word, a chapter, or a paragraph that is larger than the rest of the text. The word is ultimately derived from the Latin initiālis, which means of the beginning.
An alphanumeric outline includes a prefix at the beginning of each topic as a reference aid. The prefix is in the form of Roman numerals for the top level, upper-case letters (in the alphabet of the language being used) for the next level, Arabic numerals for the next level, and then lowercase letters for the next level.