A drive-thru sign is a sign that is typically placed outside of a restaurant or store that allows customers to order and pick up their items without having to leave their car. The crossword solutions for the term 'drive-thru sign' are 'ENTER' (5 letters) and 'MENU' (4 letters). The 'ENTER' solution indicates the entrance to the drive-thru, while the 'MENU' solution indicates the list of items available for purchase.