The at sign (@) indicate the value of a column.
In a narrative, you use the @n to include the results from the column n in the narrative.
The at sign (@) without number indicate the value of the first column. If you include multiple at signs, then the first occurrence of the sign corresponds to the first column, the second occurrence corresponds to the second column, and so on.
You can also customize the total description where the at sign (@) references the current value.
Total of @
To display the @ sign, use “@”.
For instance, in a pivot view