Ice cube
Ice cube trays are designed to be filled with water, then put in a freezer until the water freezes to ice, thus creating ice cubes. Trays are often flexible, so the ice cubes can be removed easily by flexing the tray. Another design is an aluminum tray with a lever that raises the ice cubes up, releasing them from the tray. A motorized kind of this is in most automatic ice-making freezers.