pronunciation - How does one pronounce the '@' symbol?

How can I pronounce @ symbol: At / At the rate?
Can I use it in a sentence? Please explain with an example.

Answer

How can I pronounce @ symbol: At / At the rate?

The "at mark", "at sign", or "at symbol" is its usual name. According to Wikipedia its official name is "commercial at".

Can I use it in a sentence? Please explain with an example.

It has no function in English sentences.