(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 X/Twitter names. 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/Twitter Symbol
The at sign is a prefix to a member's name on X/Twitter; for example, @BarackObama is President Obama's name. See
Internet address.