At sign - Wikipedia
https://en.wikipedia.org/wiki/At_sign
The at sign, @, is normally read aloud as "at"; it is also commonly called the at symbol, commercial at, or address sign. It is used as an accounting and invoice abbreviation meaning "at a rate of" (e.g. 7 widgets @ £ 2 per widget = £14), [1] but it is now seen more widely in email addresses and social media platform handles .
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