they use it to shorten the word AT. @=at
edit by Superflipper
@ = not an ampersand.
& = ampersand.
they use double ampersand (&&) to be trendy or honestly don't know that you're only supposed to use one. It was a ridiculous movement that started on myspace. Pronounce it as "and and".
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The ampersand is number seven on a standard keyboard.
It's called the Ampersand. See the related link for more information.
ampersand
If you mean the symbol &, it is called an ampersand.
This sign, "&," is known as an ampersand.