Question

the signal rate is sometimes called the rate​

Answer 1

What is your question ???

please ask it properly..

Answer 2

The at sign, @, is normally read aloud as "at"; it is also commonly called the at symbol or commercial at. 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 most commonly used in email addresses and social media platform "handles". The term "alphasand" is sometimes used to refer to "@", especially in East Asia.