The em dash may be used (in pairs) to distinguish parenthetical text. It may be thought of as a "strong" separator, used where a comma would not do the job. For example, "As I ran, I saw—My God!—no one was following."
The quotation dash is used to introduce quoted text.
The HTML entity names for the en dash and the em dash are &ndash and &mdash, respectively. The equivalent HTML numeric character entity references are – and —, respectively.
See also: Wikipedia:Special characters.
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