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An asterisk ( *); from asteriscus, from ἀστερίσκος, asteriskos, "little star") "asterisk", American Heritage Dictionary ἀστερίσκος, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus is a symbol or . It is so called because it resembles a conventional image of a star.

Computer scientists and mathematicians often vocalize it as star (as, for example, in the A* search algorithm or C*-algebra). In English, an asterisk is usually five-pointed in , six-pointed in typefaces, and six- or eight-pointed when handwritten. It is often used to censor offensive words, and on the Internet, to indicate a correction to a previous message.

In , the asterisk is commonly used as a wildcard character, or to denote pointers, repetition, or .

History
The asterisk derives from the two thousand year old character used by Aristarchus of Samothrace called the asteriskos, ※, which he used when proofreading Homeric poetry to mark lines that were duplicated.Kathleen McNamee, "Sigla," in Sigla and Select Marginalia in Greek Literary Papyri (Brussels: Fondation Egyptologique Reine Elisabeth, 1992), 9. is known to have also used the asteriskos to mark missing Hebrew lines from his .McNamee, "Sigla," 12. The asterisk evolved in shape over time, but its meaning as a symbol used to correct defects remained.

In the Middle Ages, the asterisk was used to emphasize a particular part of text, often linking those parts of the text to a marginal comment.Parkes, "The Technology of Printing and the Stabilization of the Symbols," 50-64. However, an asterisk was not always used.

One hypothesis to the origin of the asterisk is that it stems from the five thousand year old Sumerian character , 𒀭,Robert Bringhurst, "Asterisk," in The Elements of Typographic Style: Version 3.2 (Vancouver, BC: Hartley & Marks, 2008), 303. though this hypothesis seems to only be based on visual appearance.

(2019). 9781846146473, W. W. Norton & Company, Inc..

Usage

Censorship
When toning down , asterisks are often used to replace letters. For example, the word 'fuck' might become 'f**k', 'f*ck' or even '****'. Vowels tend to be censored with an asterisk more than consonants, but the intelligibility of censored profanities with multiple syllables such as b*ll*cks (bollocks) or uncommon ones is higher if put in context with surrounding text.Wutiolarn, Nopsarun, and Damrong Attaprechakul. A study of nonstandard orthography and vowel omission in an international online game: AuditionSEA. Language Institute, Thammasat University, 2012.

Competitive sports and games
In colloquial usage, an asterisk is used to indicate that a is somehow tainted by circumstances, which are putatively explained in a footnote referenced by the asterisk.See e.g.

Baseball
The usage of the term in sports arose after the 1961 baseball season in which of the New York Yankees broke 's 34-year-old single-season record. Because Ruth had amassed 60 home runs in a season with only 154 games, compared to Maris's 61 over 162 games, baseball commissioner announced that Maris's accomplishment would be recorded in the record books with an explanation (often referred to as "an asterisk" in the retelling). In fact, Major League Baseball had no official record book at the time, but the stigma remained with Maris for many years, and the concept of a real or figurative asterisk denoting less-than-official records has become widely used in sports and other competitive endeavors. A 2001 about Maris's record-breaking season was called 61* (pronounced sixty-one asterisk) in reference to the controversy.

The controversy over season length in relation to home run records had somewhat subsided by the time broke Ruth's career home run record in 1974 (although Aaron received an even larger volume of hate mail and death threats which in his case often focused on race). Maris's single season mark was broken in 1998 by and , who both broke it in under 154 games. McGwire's record of 70 home runs was later eclipsed by , who set the current mark of 73 home runs in the 2001 season. However, these players' accomplishments were soon questioned after evidence surfaced suggesting all three might have been taking advantage of MLB's then-lax policies related to the use of performance-enhancing drugs.

Fans were especially critical of Bonds and invoked the asterisk notion during the 2007 season, as he approached and later broke 's career home run record.See e.g. Opposing fans would often hold up signs bearing asterisks whenever Bonds came up to bat. After Bonds hit his record-breaking 756th home run on August 7, 2007, fashion designer and entrepreneur purchased the home run ball from the fan who caught it, and ran a poll on his website to determine its fate. On September 26, Ecko revealed on NBC's Today show that the ball will be branded with an asterisk and donated to the Baseball Hall of Fame. The ball, marked with a die-cut asterisk, was finally delivered to the hall on July 2, 2008 after Marc Ecko unconditionally donated the artifact rather than loaning it to the hall as originally intended.

• In recent years, the asterisk has come into use on baseball scorecards to denote a "great defensive play."

Usage in anti-doping campaigns
• By the end of the first decade of the 21st century, the association of baseball and its records with doping had become so notorious that the term "asterisk" had become firmly associated with doping in sport. In February 2011 the United States Olympic Committee and the launched an anti-steroid campaign called "Play Asterisk Free" aimed at teens. The campaign, whose logo uses a , first launched in 2008 under the name Don't Be An Asterisk. Adcouncil.org , Ad Council, August 8, 2008

Cricket
• In , it signifies a total number of runs scored by a batsman without losing his wicket; e.g. 107* means '107 '.
• Where only the scores of the two batsmen that are currently in are being shown, an asterisk following a batsman's score indicates that he is due to face the next ball to be delivered.
• When written before a player's name on a scorecard, it indicates the captain of the team.
• It is also used on television when giving a career statistic during a match. For example, 47* in a number of matches column means that the current game is the player's 47th.

Computing

Computer science
• In , the asterisk is used in regular expressions to denote zero or more repetitions of a pattern; this use is also known as the or Kleene closure after .
• In the Unified Modeling Language, the asterisk is used to denote zero to many classes.

Computer interfaces
• In some command line interfaces, such as the and 's CMD, the asterisk is the wildcard character and stands for any string of characters. This is also known as a wildcard symbol. A common use of the wildcard is in searching for files on a computer. For instance, if a user wished to find a document called Document 1, search terms such as Doc* and D*ment* would return this file. Document* would also return any file that begins with Document.
• In some graphical user interfaces an asterisk is pre- or appended to the current working document name shown in a window's title bar to indicate that unsaved changes exist. In many computing and applications an asterisk, or another character, is displayed to indicate that a character of a password or other confidential information has been entered, without the risk of displaying the actual character.
• In Commodore (and related) , an asterisk appearing next to a filename in a directory listing denotes an improperly closed file, commonly called a "splat file."
• In travel industry Global Distribution Systems, the asterisk is the display command to retrieve all or part of a Passenger Name Record.
• In , an asterisk can be used to denote required fields.
• etiquette calls on one asterisk to correct a misspelled word that has already been submitted. For example, one could post lck, then follow it with *luck or luck* (the placement of the * on the left or right is a matter of personal style) to correct the word's spelling, or if it's someone else that notices the mistake, they might also use *luck or luck*.
• Enclosing a phrase between two asterisks is used to denote an action the user is "performing", e.g. *pulls out a paper*, although this usage is also common on forums, and less so on most chat rooms due to /me or similar commands. (-action-) and double colons (::action::) as well as the operator /me are also used for similar purposes.

• Some international models of and use the asterisk to denote the total, or the terminal sum or difference of an addition or subtraction sequence, respectively, sometimes on the keyboard where the total key is marked with an asterisk and sometimes a capital T, and on the printout.

Programming languages
Many programming languages and use the asterisk as a symbol for . It also has a number of special meanings in specific languages, for instance:
• In some programming languages such as the C, C++, and Go programming languages, the asterisk is used to dereference or to declare a pointer variable.
• In the programming language, the names of are conventionally set off with asterisks, *LIKE-THIS*.
• In the Ada, , , Python, Ruby programming languages, in some dialects of the Pascal programming language, and many others, a double asterisk is used to signify : 5**3 is 53 or 125.
• In the , the asterisk is used to refer to the of all variables with a given name.
• In the programming languages Ruby and Python, * has two specific uses. First, the unary * operator applied to a list object inside a function call will expand that list into the arguments of the function call. Second, a parameter preceded by * in the parameter list for a function will result in any extra positional parameters being aggregated into a (Python) or array (Ruby), and likewise a parameter preceded by ** will result in any extra being aggregated into a dictionary (Python) or hash (Ruby).
• In the APL language, the asterisk represents the exponential and functions.
• In IBM Job Control Language, the asterisk has various functions, including in-stream data in the DD statement, the default print stream as SYSOUT=*, and as a self-reference in place of a procedure step name to refer to the same procedure step where it appears.
• In Haskell, the asterisk represents the set of well-formed, fully applied types; that is, a 0-ary kind of types.

In the B programming language and languages that borrow syntax from it, such as C, , Java, or C#, comments in the (for information to people, ignored by the ) are marked by an asterisk combined with the slash:

/* This section displays message if user input was not valid
(comment ignored by compiler) */


Some Pascal-like programming languages, for example, , Modula-2, Modula-3, and Oberon, as well as several other languages including ML, (), , , , and Maple, use an asterisk combined with a parenthesis:

(* Do not change this variable - it is used later
(comment ignored by compiler) *)


, while not a programming language, also uses the slash-star comment format. body {

 /* This ought to make the text more readable for far-sighted people */
font-size: 24pt;

}

Each computing language has its own way of handling comments; "/* ... */" and similar notations are not universal.

Economics
• In , the use of an asterisk after a letter indicating a variable such as , output, or indicates that the variable is at its optimal level (that which is achieved in a perfect market situation). For instance, p* is the price level p when output y is at its corresponding optimal level of y*.
• Also in international economics asterisks are commonly used to denote economic variables in a foreign country. So, for example, "p" is the price of the home good and "p*" is the price of the foreign good, etc.

Education
• In the GCSE and A-Level examinations in the and the PSLE in , A* (" A-star") is a special top grade that is distinguished from grade A. (This will phase out starting from 2021)
• In the Hong Kong Diploma of Secondary Education (HKDSE) examination in , 5** (5-star-star) and 5* (5-star) are two special top grades that are distinguished from Level 5. Level 5** is the highest level a candidate can attain in HKDSE.

Fluid mechanics
In an asterisk in superscript is sometimes used to mean a property at sonic speed.White, F. M. Fluid Mechanics, Fourth Ed. WCB McGraw Hill.

Games
• Certain categories of character types in role-playing games are called splats, and the game supplements describing them are called . This usage originated with the shorthand "*book" for this type of supplement to various World of Darkness games, such as Clanbook: Ventrue (for ) or Tribebook: Black Furies (for ), and this usage has spread to other games with similar character-type supplements. For example, Dungeons & Dragons Third Edition has had several lines of splatbooks: the "X & Y" series including Sword & Fist and Tome & Blood prior to the "3.5" revision, the "Complete X" series including Complete Warrior and Complete Divine, and the "Races of X" series including Races of Stone and Races of the Wild.
• In many and , as well as "male", "female", and other more esoteric genders, there is a gender called "splat", which uses an asterisk to replace the letters that differ in standard English gender pronouns. For example, h* is used rather than him or her. Also, asterisks are used to signify doing an action, for example, "* action*".
• producer used a six-pointed asterisk as his trademark. It is featured prominently on many set pieces from The Price Is Right.
• players put an asterisk after a word to indicate that an illegal play was made.

Human genetics
• In human genetics, * is used to denote that someone is a member of a and not any of its subclades (see * (haplogroup)).

Linguistics
In , an asterisk is placed before a word or phrase to indicate that it is not used, or there are no records of it being in use. This is used in several ways depending on what is being discussed.

Historical linguistics
In historical linguistics, the asterisk marks words or phrases that are not directly recorded in texts or other media, and that are therefore reconstructed on the basis of other linguistic material (see also comparative method).

In the following example, the word ainlif is a reconstructed form.

• * ainlifendleofaneleven

A double asterisk indicates a form that would be expected according to a rule, but is not actually found. That is, it indicates a reconstructed form that is not found or used, and in place of which another form is found in actual usage:

• For the plural, ** kubar would be expected, but separate masculine plural akābir أكابر and feminine plural kubrayāt كبريات are found as irregular forms.

Ungrammaticality
In most areas of linguistics, but especially in , an asterisk in front of a word or phrase indicates that the word or phrase is not used because it is .
• wake her up / *wake up her
An asterisk before a parenthesis indicates that the lack of the word or phrase inside is ungrammatical, while an asterisk after the opening bracket of the parenthesis indicates that the existence of the word or phrase inside is ungrammatical.
• go *(to) the station - Here, "go the station" would be ungrammatical.
• go (*to) home - Here, "go to home" would be ungrammatical.

Ambiguity
Since a word marked with an asterisk could mean either "unattested" or "impossible", it is important in some contexts to distinguish these meanings. In general, authors retain asterisks for "unattested", and prefix ˣ, **, †, or a superscript "?" for the latter meaning. An alternative is to append the asterisk (or another symbol, possibly to differentiate between even more cases) at the end.

Optimality Theory
In Optimality Theory, asterisks are used as "violation marks" in tableau cells to denote a violation of a constraint by an output form.

Phonetic transcription
In the early days of the International Phonetic Alphabet, an asterisk was sometimes used to denote that the word it preceded was a proper noun. See this example from W. Perrett's 1921 transcription of Gottfried Keller's "Das Fähnlein der sieben Aufrechten":
, ! .
( »Keine Rede, wird nichts daraus!« sagte Hediger kurz.)

This diacritic isn't often used.

Mathematics
The asterisk has many uses in . The following list highlights some common uses and is not exhaustive.

stand-alone
• An arbitrary point in some set. Seen, for example, when computing or when contracting a simply connected group to the singleton set { ∗ }.
as a , denoted in
• The Hodge star operator on vector spaces $*: A^k \rightarrow A^\left\{n-k\right\}$.
as a unary operator, written as a
• The pushforward (differential) of a f between two , denoted f.
• And more generally the application of any covariant , where no doubt exists over which functor is meant.
as a unary operator, written as a
• The complex conjugate of a (the more common notation is $\bar\left\{z\right\}$).
• The conjugate in a composition algebra
• The conjugate transpose, Hermitian transpose, or adjoint matrix of a matrix.
• The multiplicative group of a ring, especially when the ring is a field. E.g. $\mathbb\left\{C\right\}^* = \mathbb\left\{C\right\}-\\left\{0\\right\}.$
• The of a V, denoted V*.
• The combination of an indexed collection of objects into one example, e.g. the combination of all the Hk( X) into the H*( X).
• In statistics, z* and t* are given critical points for z-distributions and t-distributions, respectively.
as a , in
• A notation for an arbitrary binary operator.
• The of two groups.
• fg is a of f with g.
• A notation for the horizontal composition of two natural transformations.

The asterisk is used in all branches of mathematics to designate a correspondence between two quantities denoted by the same letter – one with the asterisk and one without.

Mathematical typography
In fine mathematical typography, the character (in HTML, &lowast;) is available. This character also appeared in the position of the regular asterisk in the symbol character set in the Symbol font included with Windows and Macintosh operating systems and with many printers. It should be used in fine typography for a large asterisk that lines up with the other mathematical operators.

Music
• In musical notation the sign () indicates when the of the piano should be lifted.
• In , an asterisk is often used to denote a deliberate pause.

Religious texts
• In the Geneva Bible and the King James Bible, an asterisk is used to indicate a marginal comment or scripture reference.
• In the Leeser Bible, an asterisk is used to mark off the seven subdivisions of the weekly Torah portion. It is also used to mark the few verses to be repeated by the reader of the Haftara.
• In American printings of the Book of Common Prayer, an asterisk is used to divide a verse of a Psalm in two portions for responsive reading. British printings use a spaced colon (" : ") for the same purpose.

Star of Life
Replacement for cross/crescent/star on ambulances.

Statistical results
In many scientific publications, the asterisk is employed as a shorthand to denote the statistical significance of results when testing . When the likelihood that a result occurred by chance alone is below a certain level, one or more asterisks are displayed. Popular significance levels are <0.05 (*), <0.01 (**), and <0.001 (***).

Telephony
On a keypad, the asterisk (called star, or less commonly, palm or ) is one of the two special keys (the other is the ( pound sign or hash, hex or, less commonly, octothorp or square)), and is found to the left of the zero. They are used to navigate menus in systems such as , or in Vertical service codes.

Typography
• The asterisk is used to call out a , especially when there is only one on the page. Less commonly, multiple asterisks are used to denote different footnotes on a page (i.e., *, **, ***). Typically, an asterisk is positioned after a word or phrase and preceding its accompanying footnote. Other characters are also used for this purpose, including †, ‡, superscript numbers (as in Wikipedia), etc. In marketing and advertising, asterisks or other symbols are used to refer readers discreetly to terms or conditions for a certain statement, the "".
• In English-language typography the asterisk is placed after all other punctuation marks (for example, commas, colons, or periods) except for the dash.
• Three spaced asterisks centered on a page may represent a jump to a different scene, thought, or section.
• A group of three asterisks arranged in a triangular formation is called an asterism.
• One or more asterisks may be used as censorship over all or part of a word.
• Asterisks are sometimes used as an alternative to typographical bullets to indicate items of a list.
• Asterisks can be used in textual media to represent *emphasis* when or is not available (e.g., , ).
• Asterisks may denote corrections to misspelling or misstatements in previous electronic messages, particularly when replacement or retraction of a previous writing is not possible, such as with "immediate delivery" messages or "instant messages" that can't be edited. Usually this takes the form of a message consisting solely of the corrected text, with an asterisk placed prior to the correction. For example, one might send a message reading "*morning" to correct the misspelling in the message "I had a good ".
• Bounding asterisks as "a kind of self-describing stage direction", as linguist has put it. For example, in " Another gas station robbery *sigh*," the writer uses *sigh* to express disappointment (but does not necessarily literally sigh).

Encodings
The standard states that the asterisk is distinct from:
• ,
• , and
• .

The symbols are compared below (the display depends on your browser's font).

*

٭

 Displayed ("The following sections present the complete lists of character entity references." ("ast;"). * ͙ ٭ ※ ⁕ ⁂ ⁎ ⁑ ⃰ ∗ ⊛ ✢ ✣ ✤ ✥ ✱ ✲ ✳ ✺ ✻ ✼ ✽ ❃ ❉ ❊ ❋ ⧆ ⩮ ꙳ ﹡ ＊ 𝆯 🞯 🞰 🞱 🞲 🞳 🞴 🞵 🞶 🞷 🞸 🞹 🞺 🞻 🞼 🞽 🞾 🞿

Notes
27. Basic differences between the Asterisk And FreeSWITCH

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