See examples of @ ('at' or 'at sign' or 'address sign'), the symbol in e-mail addresses separating the name of the user from the user's Internet address.
2022年4月11日 ... The at sign is a typographical symbol (not a punctuation mark) and has one usage in which it may appear in formal writing. However, it does have ...
Officially called an "asperand," the at sign separates the recipient's name from the domain name in email; for example, [email protected]. A Twitter Symbol. The ...