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Related to at sign: hashtag
at signThe at sign (@), which is shorthand for the word "at," has become widely identified around the world due to its use in Internet e-mail addresses and Twitter names. Officially called an "asperand," the at sign separates the recipient's name from the domain name in e-mail; for example, email@example.com.
A Twitter Symbol
The at sign is a prefix to a member's name on Twitter; for example, @BarackObama is President Obama's Twitter name. See Internet address.