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Concept
Colon (punctuation)
Summary
The colon, , is a punctuation mark consisting of two equally sized dots aligned vertically. A colon often precedes an explanation, a list, or a quoted sentence. It is also used between hours and minutes in time, between certain elements in medical journal citations, between chapter and verse in Bible citations, and, in the US, for salutations in business letters and other formal letter writing.
In Ancient Greek, in rhetoric and prosody, the term κῶλον (kôlon, 'limb, member of a body') did not refer to punctuation, but to a member or section of a complete thought or passage; see also Colon (rhetoric). From this usage, in palaeography, a colon is a clause or group of clauses written as a line in a manuscript.
In the 3rd century BC, Aristophanes of Byzantium is alleged to have devised a punctuation system, in which the end of such a kôlon was thought to occasion a medium-length breath, and was marked by a middot . In practice, evidence is scarce for its early usage, but it was revived later as the ano teleia, the modern Greek semicolon. Some writers also used a double dot symbol , that later came to be used as a full stop or to mark a change of speaker. (See also Punctuation in Ancient Greek.)
In 1589, in The Arte of English Poesie, the English term colon and the corresponding punctuation mark is attested:
For these respectes the auncient reformers of language, inuented, three maner of pauses [...] The shortest pause or intermission they called comma [...] The second they called colon, not a peece but as it were a member for his larger length, because it occupied twise as much time as the comma. The third they called periodus, [...]
In 1622, in Nicholas Okes' print of William Shakespeare's Othello, the typographical construction of a colon followed by a hyphen or dash to indicate a restful pause is attested. This construction, known as the dog's bollocks, was once common in British English; though this usage is now discouraged.
Official source
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