The term 'cafeteria stack' refers to the equipment used in a cafeteria setting. The crossword solutions for this term are 'TRAY' (4 letters), 'trays' (5 letters), and 'URN' (3 letters). A TRAY is a flat, shallow container with a raised edge, typically used to serve food. Trays are often stacked together to make it easier to transport multiple items at once. An URN is a large container with a spout, used to store and dispense hot beverages such as coffee or tea. In a cafeteria setting, trays and urns are essential pieces of equipment for serving food and drinks.