Icon for a button to move a list item. Not scroll [on hold]

In our software we have a dropdown menu. The dropdown menu has listitems which represent columns for a table. Via two buttons in the list (on the left side), the position of the listitems can be changed. The position of the columns in the table will also be changed. The dropdown looks like this:

Problem: The buttons to move the position accidentally communicate that the list can be scrolled. Reason: The icon is looking like a typical icon for scroll buttons:

There is also another typical scroll icon we cannot use:

Question: How can we communicate via icons in the buttons, that the buttons change the position of the selected list item?