Colon

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This punctuation mark (:) can 

1. signal a forthcoming list, as in He sold sundries: needles, thread, pins, buttons, and thimbles; 
2. introduce a further amplification or a summary of what has just been said, as in After years of work, he finally had it: the championship; 
3. let one clause explain another, as in He was late: his car had broken down; 
4. lead into a long quotation, as in Jefferson wrote: When in the course of human events,…; and 
5. do such separating tasks as these: Henry IV, Pt. I, II:iv:122; Dear Sir:; New York: Longman, 1987; and 11:15 A.M.  1
   

 

 

The Columbia Guide to Standard American English. Copyright © 1993 Columbia University Press.