double-decker

noun5

1. •
   A vehicle (usually a bus, coach or train) or aircraft with two floors.
2. •
   A frigate with two decks above the waterline.
3. •
   A headline that is two lines long.
4. •
   (figurative) Any object with two layers or parts stacked on top of each other.
5. •
   (figurative) A sandwich with three slices of bread, whose toppings are on both sides of the middle slice.