three-decker

noun3

1. •
   Anything with three layers or levels.

   • He awoke at midday and walked down the road to a cafeteria where the short-order cook fixed him a delicious three-decker western sandwich and coffee. — 1954
2. •
   (historical) A sailing warship that had guns on each of three decks.
3. •
   (historical) An old-fashioned pulpit.