I would like to know the name of @

If you had tried to Google it this is just one answer you would find.

At sign - Wikipedia, the free encyclopedia

The at sign (@), also called the ampersat, apetail, arroba, atmark, acosta, at symbol, commercial at, curlat or monkey tail, is formally an abbreviation of the accounting and commercial invoice term "at the rate of"

Foil, when you quote a source verbatum you should be using quotation marks. This is from wikipedia. "The at sign (@), also called the ampersat, apetail, arroba, atmark, acosta, at symbol, commercial at, curlat or monkey tail, is formally an abbreviation of the accounting and commercial invoice term "at the rate of" I know you are somewhat new to this site but Smoothy did it correctly by posting the link and not giving the appearance of using someone else's answer as their own.

This symbol represents "at the rate of" ;)