\text{---}
The em dash (\text{---}) is a punctuation mark used to create a strong break in the structure of a sentence. It can replace commas, parentheses, or colons for added emphasis or an abrupt change in thought.
Em dash used to emphasize the conclusion of a statement.
The results were clear \text{---} the experiment was a success.
Em dash used to set off a list within a sentence.
She was the best candidate \text{---} intelligent, experienced, and dedicated \text{---} for the job.
Em dash used to create a pause for dramatic effect.
I need to tell you something \text{---} something important.