Colon ( punctuation ) - wikipedia Colon ( punctuation ) This article 's lead section does not adequately summarize key points of its contents. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. Please discuss this issue on the article 's talk page. ( July 2012 ) : Colon ː : ∶ IPA triangular colon Fullwidth colon Ratio Punctuation apostrophe ' ' brackets ( ) ( ) ( ) ⟨ ⟩ colon : comma, ، 、 dash ‒ -- -- ― ellipsis...... ⋯ ᠁ ฯ exclamation mark ! full stop, period. guillemets `` '' `` '' hyphen ‐ hyphen - minus - question mark ? quotation marks ' ' `` '' ' ' `` '' semicolon ; slash, stroke, solidus / ⁄ Word dividers interpunct space General typography ampersand & asterisk * at sign @ backslash \bullet caret dagger † ‡ degree ° ditto mark '' inverted exclamation mark ¡ inverted question mark ¿ komejirushi, kome, reference mark ※ number sign, pound, hash # numero sign No obelus ÷ multiplication sign × ordinal indicator o a percent, per mil % ‰ plus and minus + − equals sign = basis point ‱ pilcrow ¶ prime ′ '' ′′′ section sign § tilde ~ underscore, understrike _ vertical bar, pipe, broken bar ‖ ¦ Intellectual property copyright © sound - recording copyright ℗ registered trademark ® service mark SM trademark TM Currency currency sign ¤ currency symbols ؋ ​ ₳ ​ ฿ ​ ₿ ​ ₵ ​ ¢ ​ ₡ ​ ₢ ​ $ ​ ₫ ​ ₯ ​ ֏ ​ ₠ ​ € ​ ƒ ​ ₣ ​ ₲ ​ ₴ ​ ₭ ​ ₺ ​ ₾ ​ ₼ ​ M ​ ₥ ​ ₦ ​ ₧ ​ ₱ ​ ₰ ​ £ ​ 元 圆 圓 ​ ریال ​ ៛ ​ ₽ ​ ₹ Rs ​ ₪ ​ ৳ ​ ₸ ​ ₮ ​ ₩ ​ ¥ 円 Uncommon typography asterism ⁂ fleuron, hedera ❧ index, fist ☞ interrobang ‽ irony punctuation ⸮ lozenge ◊ tie ⁀ Related Diacritics Logic symbols Whitespace characters In other scripts Chinese Hebrew Japanese Korean Portal Book The colon ( : ) is a punctuation mark consisting of two equally sized dots centered on the same vertical line. A colon precedes an explanation or an enumeration, or list. A colon is also used with ratios, titles and subtitles of books, city and publisher in bibliographies, Biblical citations between chapter and verse, and -- in American English -- to separate hours and minutes, for business letter salutations and in formal letter writing. In Unicode, it is encoded at U + 003A : Colon. Contents 1 Usage 1.1 Syntactical - deductive 1.2 Syntactical - descriptive 1.3 Appositive 1.4 Segmental 1.5 Use of capitals 1.6 Spacing 2 History 3 International Phonetic Alphabet 4 Word - medial separator 5 Abbreviation 6 End of sentence 7 Letter 8 Mathematics and logic 9 Computing 9.1 Addresses 9.2 Other languages 10 Internet usage 11 References 12 External links Usage The most common use of the colon is to inform the reader that what follows the colon proves, explains, defines, describes, or lists elements of what preceded it. In modern American English usage, a complete sentence precedes a colon, while a list, description, explanation, or definition follows it. The elements which follow the colon may or may not be a complete sentence : since the colon is preceded by a sentence, it is a complete sentence whether what follows the colon is another sentence or not. While it is acceptable to capitalize the first letter after the colon in American English, it is not the case in British English, except where a proper noun immediately follows a colon. colon used before list Williams was so hungry he ate everything in the house : chips, cold pizza, pretzels and dip, hot dogs, peanut butter and candy. colon used before a description Jane is so desperate that she 'll date anyone, even Tom : he 's uglier than a squashed toad on the highway, and that 's on his good days. colon before definition For years while I was reading Shakespeare 's Othello and criticism on it, I had to constantly look up the word `` egregious '' since the villain uses that word : outstandingly bad or shocking. colon before explanation I had a rough weekend : I had chest pain and spent all Saturday and Sunday in the emergency room. Some writers use fragments ( incomplete sentences ) before a colon for emphasis or stylistic preferences ( to show a character 's voice in literature ), as in this example : Dinner : chips and juice. What a well - rounded diet I have. The Bedford Handbook describes several uses of a colon. For example, one can use a colon after an independent clause to direct attention to a list, an appositive or a quotation, and it can be used between independent clauses if the second summarizes or explains the first. In non-literary or non-expository uses, one may use a colon after the salutation in a formal letter, to indicate hours and minutes, to show proportions, between a title and subtitle, and between city and publisher in bibliographic entries. Luca Serianni, an Italian scholar who helped to define and develop the colon as a punctuation mark, identified four punctuational modes for it : syntactical - deductive, syntactical - descriptive, appositive, and segmental. Although Serianni wrote this guide for the Italian language, his definitions apply also to English and many other languages. Syntactical - deductive The colon introduces the logical consequence, or effect, of a fact stated before. There was only one possible explanation : the train had never arrived. Syntactical - descriptive In this sense the colon introduces a description ; in particular, it makes explicit the elements of a set. I have three sisters : Daphne, Rose, and Suzanne. Syntactical - descriptive colons may separate the numbers indicating hours, minutes, and seconds in abbreviated measures of time. The concert begins at 21 : 45. The rocket launched at 09 : 15 : 05. British English, however, more frequently uses a point for this purpose : The programme will begin at 8.00 pm. You will need to arrive by 14.30. Appositive Luruns could not speak : he was drunk. An appositive colon also separates the subtitle of a work from its principal title. Dillon has noted the impact of colons on scholarly articles, but the reliability of colons as a predictor of quality or impact has also been challenged. In titles, neither needs to be a complete sentence as titles do not represent expository writing : Star Wars Episode VI : Return of the Jedi Segmental Like a dash or quotation mark, a segmental colon introduces speech. The segmental function was once a common means of indicating an unmarked quotation on the same line. The following example is from the grammar book The King 's English : Benjamin Franklin proclaimed the virtue of frugality : A penny saved is a penny earned. This form is still used in written dialogues, such as in a play. The colon indicates that the words following an individual 's name are spoken by that individual. Patient : Doctor, I feel like a pair of curtains. Doctor : Pull yourself together ! Use of capitals Use of capitalization or lower - case after a colon varies. In British English, the word following the colon is in lower case unless it is normally capitalized for some other reason, as with proper nouns and acronyms. British English also capitalizes a new sentence introduced by colon 's segmental use ; American English goes further and permits writers to similarly capitalize the first word of any independent clause following a colon. This follows the guidelines of some modern American style guides, including those published by the Associated Press and the Modern Language Association. The Chicago Manual of Style, however, requires capitalization only when the colon introduces a direct quotation, a direct question, or two or more complete sentences. In many European languages, the colon is usually followed by a lower - case letter unless the upper case is required for other reasons, as with British English. German usage requires capitalization of independent clauses following a colon. Dutch further capitalizes the first word of any quotation following a colon, even if it is not a complete sentence on its own. Spacing In print, a thin space was traditionally placed before a colon and a thick space after it. In modern English - language printing, no space is placed before a colon and a single space is placed after it. In French - language typing and printing, the traditional rules are preserved. One or two spaces may be and have been used after a colon. The older convention ( designed to be used by monospaced fonts ) was to use two spaces after a colon. See also : Sentence spacing History Further information : Colon ( rhetoric ) The English word `` colon '' is from Latin colon ( pl. cola ), itself from Ancient Greek κῶλον ( kôlon ), meaning `` limb '', `` member '', or `` portion ''. In Greek rhetoric and prosody, the term did not refer to punctuation but to the expression or passage itself. A `` colon '' was section of a complete thought or passage. From this usage, in palaeography, a colon is a clause or group of clauses written as a line in a manuscript. In the punctuation system devised by Aristophanes of Byzantium in the 3rd century BC, the end of such a clause was thought to occasion a medium - length breath and was marked by a middot ⟨ ⟩. ( This was only intermittently used, but eventually revived as the ano teleia, the modern Greek semicolon. ) A double dot symbol ⟨ ⁚ ⟩, meanwhile, later came to be used as a full stop or to mark a change of speaker. A variant was introduced to English orthography around 1600, marking a pause intermediate between a comma and a period. As late as the 18th century, the appropriateness of a colon was still being related to the length of the pause taken when reading the text aloud, but silent reading eventually replaced this with other considerations. In British English, it was once common for a colon to be followed by a hyphen or dash to indicate a restful pause, in a typographical construction known as the `` dog 's bollocks '', though this usage is now discouraged. International Phonetic Alphabet A special triangular colon symbol is used in IPA to indicate that the preceding sound is long. Its form is that of two triangles, each a little larger than a point ( dot ) of a standard colon, pointing toward each other. It is available in Unicode as modifier letter triangular colon, Unicode U + 02D0 ( ː ). A regular colon is often used as a fallback when this character is not available, and in the practical orthography of some languages which have a phonemic long / short distinction in vowels. If the upper triangle is used without the lower one ( modifier letter half triangular colon, Unicode U + 02D1 : ⟨ ˑ ⟩ ), it designates a `` half - long '' vowel. Other phonetic alphabets also use colons. For example, the Uralic Phonetic Alphabet uses U + 02F8 ˸ MODIFIER LETTER RAISED COLON Word - medial separator In Finnish and Swedish, the colon can appear inside words in a manner similar to the apostrophe in the English possessive case, connecting a grammatical suffix to an abbreviation or initialism, a special symbol, or a digit ( e.g., Finnish USA : n and Swedish USA :s for the genitive case of `` USA '', Finnish % : ssa for the inessive case of `` % '', or Finnish 20 : een for the illative case of `` 20 '' ). Abbreviation In Swedish, the colon is used in contractions, such as S : t for Sankt ( Swedish for `` Saint '' ), e.g. in the Stockholm metro station S : t Eriksplan. This can even occur in people 's names, for example Antonia Ax : son Johnson ( Ax : son for Axelson ). The colon was also used to mark abbreviations in early modern English. End of sentence In Armenian, a colon indicates the end of a sentence, similar to a Latin full stop or period. Letter The colon is also used as a grammatical tone letter in Budu in the Democratic Republic of the Congo, in Sabaot in Kenya, in some Grebo in Liberia, and in Papua New Guinea : Erima, Gizra, Go ꞉ bosi, Gwahatike, Kaluli, Kamula, Kasua, Kuni - Boazi, and Zimakani. The Unicode character used for the tone letter U + A789 ꞉ modifier letter colon is different from the punctuation ( U + 003A ), as well from IPA 's triangular colon U + 02D0. Mathematics and logic This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( January 2018 ) This section possibly contains original research. Please improve it by verifying the claims made and adding inline citations. Statements consisting only of original research should be removed. ( January 2018 ) The colon is used in mathematics, cartography, model building, and other fields -- in this context it denotes a ratio or a scale, as in 3 : 1 ( pronounced `` three to one '' ). When a ratio is reduced to a simpler form, such as 10 : 15 to 2 : 3, this may be expressed with a double colon as 10 : 15 : : 2 : 3 ; this would be read `` 10 is to 15 as 2 is to 3 ''. This form is also used in tests of logic where the question of `` Dog is to Puppy as Cat is to _____ ? '' can be expressed as `` Dog : Puppy : : Cat : _____ ''. Unicode provides a distinct character U + 2236 ∶ ratio for mathematical usage. In some languages ( e.g. German, Russian and French ), the colon is the commonly used sign for division ( instead of ÷ ). The notation G : H may also denote the index of a subgroup. The notation ƒ : X → Y indicates that f is a function with domain X and codomain Y. The combination with an equal sign ( ≔ ) is used for definitions. In mathematical logic, when using set - builder notation for describing the characterizing property of a set, it is used as an alternative to a vertical bar ( which is the ISO 31 - 11 standard ), to mean `` such that ''. Example : S = ( x ∈ R : 1 < x < 3 ) ( displaystyle S = ( x in mathbb ( R ) : 1 < x < 3 ) ) ( S is the set of all x in R ( displaystyle mathbb ( R ) ) ( the real numbers ) such that x is strictly greater than 1 and strictly smaller than 3 ) In older literature on mathematical logic, it is used to indicate how expressions should be bracketed ( see Glossary of Principia Mathematica ). In type theory and programming language theory, the colon sign after a term is used to indicate its type, sometimes as a replacement to the `` ∈ '' symbol. Example : λ x. x : A → A ( displaystyle lambda x.x ( mathrel ( : ) ) A \to A ). Some languages like Haskell use a double colon ( : : ) to indicate type instead. A colon is also sometimes used to indicate a tensor contraction involving two indices, and a double colon ( : : ) for a contraction over four indices. Additional colon - related symbols for math are encoding in Unicode : U + 2255 ≕ EQUALS COLON U + 2982 ⦂ Z NOTATION TYPE COLON U + 2A74 ::= DOUBLE COLON EQUAL U + 2AF6 ⫶ TRIPLE COLON OPERATOR Computing See also : Semicolon § Computing usage This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( November 2011 ) In computing, the colon character is represented by ASCII code 58, ( HTML & # 58 ; ) and Unicode U + 003A : colon. Several compatibility forms for Chinese and Japanese typography are also encoded : U + FE13 : PRESENTATION FORM FOR VERTICAL COLON is a compatibility character for the Chinese Standard GB 18030. U + FF1A : FULLWIDTH COLON U + FE55 : SMALL COLON is a compatibility character for the Chinese National Standard CNS 11643. In Hebrew : U + 05C3 ׃ SOF PASSUK is used in some writings such as prayer books to signal the end of a verse. Several programming languages use the colon for various purposes. A number of programming languages, most notably Pascal and Ada, use a colon immediately followed by an equality sign ( : = ), in which case the colon and the equality sign are considering to compose to an independent assignment sign ; this can be represented in Unicode as U + 2254 ≔ colon equals. Labels -- targets for jumps, notably goto, but also some switch statements -- are general formed of a label name followed by a colon. These include C and DOS batch files. For the double colon used in computer programming, see the scope resolution operator, and class member access of C++. The colon is also used as part of the ? : conditional operator in C and other languages. In a number of languages, including JavaScript and Python, colons are used to define name - value pairs in a dictionary or object. var obj = ( name : `` Charles '', age : 18, ) The colon is also used in many operating systems commands. It is often used as a single post-fix delimiter, signifying a token keyword had immediately preceded it or the transition from one mode of character string interpretation to another related mode. Some applications, such as the widely used MediaWiki, utilize the colon as both a pre-fix and post-fix delimiter. In wiki markup, the colon is often used to indent text. Common usage includes separating or marking comments in a discussion as replies ( see WP : INDENT ), or to distinguish certain parts of a text. Markup Renders as Normal text. : Dented text by the means of a colon. : : The gap increases with colon number. Normal text. Dented text by the means of a colon. The gap increases with colon number. Addresses The colon is quite often used as a special control character in URLs, computer programming languages, in the path representation of several file systems ( such as FAT, following the drive letter, as in C : Windows , and HFS ). In an IPv6 address colons ( and one optional double colon ) separate up to 8 groups of 16 bits in hexadecimal representation. In a URL a colon follows the initial scheme name ( such as HTTP and FTP ), and separates a port number from the hostname or IP address. Other languages In BASIC, it is used as a separator between the statements or instructions in a single line, which is represented in other languages via the semicolon. In Forth, a colon precedes definition of a new word. Haskell uses a colon ( pronounced as `` cons '', short for `` construct '' ) as an operator to add an element to the front of a list : `` child '' : ( `` woman '', `` man '' ) -- returns ( `` child '', `` woman '', `` man '' ) while a double colon : : is read as `` has type of '' ( confer scope resolution operator ) : ( `` text '', False ) : : ( ( Char ), Bool ) The ML languages ( including Standard ML and OCaml ) have the above reversed, where the double colon ( : : ) is used to add an element to the front of a list ; and the single colon ( : ) is used for type guards. MATLAB uses the colon as a binary operator that generates vectors, as well as to select particular portions of existing matrices. In Python, which uses indentation to indicate blocks, the colon is used in statements to indicate that the next line is the start of an indented block. APL uses the colon to introduce a control structure element. In this usage it must be the first non-blank character of the line. after a label name that will be the target of a : goto or a right - pointing arrow ( Note : this style of programming is deprecated and programmers are encouraged to use control structures instead ). to separate a guard ( boolean expression ) from its expression in a dynamic function. Two colons are used for an Error guard ( one or more error numbers ). Colon + space are used in class definitions to indicate inheritance. U + 2360 ⍠ APL FUNCTIONAL SYMBOL QUAD COLON is used by APL for its variant operator. In the esoteric programming language INTERCAL, the colon is called `` two - spot '' and is used to identify a 32 - bit variable -- distinct from a spot (. ) which identifies a 16 - bit variable. Internet usage This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( January 2018 ) On the Internet, a colon, or multiple colons, is sometimes used to denote an action ( similar to how asterisks are used ) or to emote ( for example, in vBulletin ). In the action denotation usage it has the inverse function of quotation marks, denoting actions where unmarked text is assumed to be dialogue. For example : Tom : Pluto is so small ; it should not be considered a planet. It is tiny ! Mark : Oh really ? : : drops Pluto on Tom 's head : : Still think it 's small now ? Colons may also be used for sounds, e.g., : : click : :, though sounds can also be denoted by asterisks or other punctuation marks. Colons can also be used to represent eyes in emoticons. References Jump up ^ `` Semicolon & Colon Rules ''. Georgia College Writing Center. Retrieved 17 April 2013. Jump up ^ `` Punctuation : Colon ''. Retrieved 25 February 2015. Jump up ^ Hacker, Diana ( 2010 ). The Bedford Handbook. Boston - New York : Bedford / St. Martin 's. pp. 384 -- 387. ISBN 0 - 312 - 65269 - 0. Jump up ^ Serianni, Luca ; Castelvecchi, Alberto ( 1988 ). Grammatica italiana. Italiano comune e lingua letteraria. Suoni, forme, costrutti ( in Italian ). Turin : UTET. ISBN 88 - 02 - 04154 - 7. Jump up ^ Data elements and interchange formats -- Information interchange -- Representation of dates and times Jump up ^ Trask, Larry ( 1997 ). `` The Colon ''. Guide to Punctuation. Retrieved 28 July 2011. Jump up ^ Example quoted in An Educational Companion to Eats, Shoots & Leaves by Lynne Truss Jump up ^ Dillon, J.T. ( 1981 ). `` The emergence of the colon : An empirical correlate of scholarship ''. American Psychologist. 36 ( 8 ) : 879 -- 884. doi : 10.1037 / 0003 - 066x. 36.8. 879. Jump up ^ Dillon, J.T. ( 1982 ). `` In Pursuit of the Colon : A Century of Scholarly Progress : 1880 - 1980 ''. The Journal of Higher Education. 53 ( 1 ) : 93 -- 99. doi : 10.2307 / 1981541. Jump up ^ Townsend, Michael A.R. ( 1983 ). `` Titular Colonicity and Scholarship : New Zealand Research and Scholarly Impact '' ( PDF ). New Zealand Journal of Psychology. 12 : 41 -- 43. Jump up ^ Lupo, James ; Kopelman, Richard E. ( 1987 ). `` Punctuation and publishability : A reexamination of the colon ''. American Psychologist. 42 ( 5 ) : 513 -- 513. doi : 10.1037 / 0003 - 066x. 42.5. 513. a. Jump up ^ `` Chicago Style Q&A : Capitalization ''. Chicagomanualofstyle.org. Retrieved 2011 - 11 - 08. Jump up ^ Duden Newsletter vom 24.08. 2001 Jump up ^ `` Hoofdletter na dubbele punt ''. taaladvies.net. Retrieved 2011 - 11 - 08. Jump up ^ Paterson, Derek ( 2009 - 11 - 19 ). `` How many spaces after a colon ? ''. Absolute Write forums. Post 4. Retrieved 2012 - 11 - 04. Back in the typewriter day, when fading ink ribbons could result in commas being mistaken for periods and vice versa, typists were taught to insert 2 spaces after the period to differentiate between the two. The same happened with colons and semicolons : 2 spaces were left after a colon ; 1 space after a semicolon. Jump up ^ Oxford English Dictionary, 1st ed. `` colon, n. 2 '' Oxford University Press ( Oxford ), 1891. Jump up ^ Nicolas, Nick. `` Greek Unicode Issues : Punctuation Archived August 6, 2012, at Archive.is ''. 2005. Accessed 7 Oct 2014. Jump up ^ John Bullokar 's An English expositor ( 1616 ) glosses Colon as `` A marke of a sentence not fully ended which is made with two prickes. '' Jump up ^ John Mason 's work, An Essay on Elocution ( 1748 ), notes that `` A Comma Stops the Voice while we may privately tell one, a Semi Colon two ; a Colon three : and a Period four. '' Jump up ^ Dean, Paul ( April 25, 2008 ). `` Extreme Type Terminology Part 4 : Numerals and Punctuation ''. I Love Typography. Retrieved 28 November 2014. Jump up ^ Martens, Nick ( January 20, 2010 ). `` The Secret History of Typography in the Oxford English Dictionary ''. The Bygone Bureau. Retrieved 28 November 2014. Jump up ^ Trask, Larry. `` The Colon ''. University of Sussex. Retrieved 28 November 2014. Jump up ^ `` The International Phonetic Alphabet ''. Weston Ruter. 2005. Retrieved 27 October 2011. Jump up ^ Everson, Michael ; et al. ( 2002 - 03 - 20 ). `` L2 / 02 - 141 : Uralic Phonetic Alphabet characters for the UCS '' ( PDF ). Jump up ^ Ioppolo, Grace ( 2006 ). Dramatists and their manuscripts in the age of Shakespeare, Jonson, Middleton and Heywood. Psychology Press. p. 73. Jump up ^ Mueller, Janel ; Scodel, Joshua, eds. ( 2009 ). Elizabeth I : translations, 1544 - 1589. University of Chicago Press. p. 460. Jump up ^ Peter G. Constable, Lorna A. Priest, Proposal to Encode Additional Orthographic and Modifier Characters, 2006. Jump up ^ Whistler, Ken ; Freytag, Asmus ( 2000 - 04 - 19 ). `` L2 / 00 - 119 : Encoding Additional Mathematical Symbols in Unicode '' ( PDF ). ^ Jump up to : Berners - Lee, T. ; Fielding, R. ; Masinter, L. ( January 2005 ). Uniform Resource Identifier ( URI ) : Generic Syntax IETF. STD 66, RFC 3986. Jump up ^ Hinden, R. ; Deering, S. ( Februari 2006 ) IP Version 6 Addressing Architecture. IETF. RFC 4291. Jump up ^ Real World Haskell by Bryan O'Sullivan, Don Stewart, and John Goerzen Jump up ^ `` Learn You a Haskell for Great Good ! - Types and Typeclasses ''. Learnyouahaskell.com. Retrieved 2011 - 11 - 08. ^ Jump up to : `` Dyalog APL Language Reference Manual '' ( PDF ). Retrieved 2012 - 02 - 14. External links Wikimedia Commons has media related to Colons. `` Using the Colon ''. On - line Writing Lab. Northland Community and Technical College. Archived from the original on October 16, 2014. Retrieved 2 December 2013. 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Question: while writing time the number after the two dots stands for
Answer: minutes