A punctuation mark with three main uses:
 To introduce a list:
There are two other varieties of cedarwood oil: Texas (Juniperusashei) and Virginian (Juniperus virginiana).
 To introduce a piece of direct speech, or a quotation:
At once he said: ‘I do not mean your immediate brief journey’.
 To separate two parts of a sentence where the first leads on to the second:
And that is the end of the poor man’s hopes: there is no return to eligibility.
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