Absolute reference to table column in formula

Hello,
What is the equivalent of the "$" when referring to table columns?

So if I wanted a reference's row to change but not column, I'd use $A1 so I could drag it down and across and it refer to the correct row and column.

How do I do the same with a table column reference, so that no matter where I drag the formula it always refers to the same column?

Thanks a lot,
JJ