Unknown formula usage

[MinionMan63]

I have downloaded a spreadsheet and in the formula there is (@) symbol in the formula. What does it do or stand for? I am unfamiliar with is usage.

=SUMIFS(ItemizedExpenses[Amount],ItemizedExpenses[G/L Code],[@[G/L Code]],ItemizedExpenses[Purchase Date],">="&D$3,ItemizedExpenses[Purchase Date],"<="&D$4)

Could some one please explain in what context it is used.

Thank you from a newbie learning new functions.

 

[sheetspread]

Structured reference with a table field instead of range:

https://exceljet.net/glossary/structured-reference

 

[MinionMan63]

Thank you for clearing that up. Now I know.