$ITEMUSED is a system variable that tracks how many times a certain item is used. Note that it is prefixed with a dollar symbol, not a percentage sign. In the Items tab, one can edit the maximum uses of a specific item. If a maximum is imposed, after the item reaches this limit, it can no longer be used; setting that item's $ITEMUSED variable to zero resets the count, allowing it to be used again. An item can be limited to one to eight uses, or the limit can be left infinite.