Things That Are Square with D

• Dice

  Dice are cubes with square faces, classic example.

• Dance floor

  Often set up as a big square floor area.

• Dining table

  Square dining tables are common 4-seat tables.

• Dictionary

  Book‑shaped, many are printed as neat rectangles

• Deck of cards

  Stack forms a near‑rectangular, boxy block

• Door mat
• doggy door

  Small square/rectangular flap for pets in doors

• Desktop

  Computer desktops show square/rectangular icons

• dumpster

  Large metal trash container, very box‑shaped

• Dungeon

  Game dungeons use classic square grids

• Dropbox

  Dropbox logo/app icon is a square on screens

• Drawing of a square

  A drawing of a square is literally square!

• Doors CD case

  Older CD cases are almost perfect squares

• Dog doors

  Dog doors are often sold as small square flaps

• Dark square

  Explicitly a square thing, fits perfectly

The words in the list Things That Are Square with D come from players of the word game City, Country, River.