(1) In a DNS record, the at sign (@) identifies the domain being referenced. See
DNS records.
(2) The at sign (@) has become widely identified around the world due to its use in Internet email addresses and names on X. Officially called an "asperand," the at sign separates the recipient's name from the domain name in email; for example, me@mycompany.com.
An X Symbol
The at sign is a prefix to a member's name on X; for example, @BarackObama is President Obama's name. See
Internet address.