Joseph,

Can you explain the context? Generally, user variable names in a SQL batch are preceded by an @:

DECLARE @MyVariable varchar(100)
SET @MyVariable = 'Joseph is pretty cool!'
Certain system state values are preceded by @@. For example, to see what is currently set as the first weekday of the week:

SELECT @@DATEFIRST AS FirstDayOfWeek
If that's not what you mean, then...