Cast-iron boxes or plates, about 230 mm square, built into parapets of road bridges.

Medipix-2, Timepix, and Medipix-3 are all 256x256 pixels, each 0.055mm square, forming a total area 14.08mm x 14.08mm.

The size of wafers for photovoltaics is 100-200 mm square and the thickness is 200-300 μm.

The 2D is entirely different in concept and measures 134 mm square by 27 mm deep.

The Hong Kong nets are generally 35 mm square on the surface 2 m and 100 mm square thereafter.

Billet casters cast smaller section sizes, such as below 200 mm square, with lengths up to 12 m long.

The size of the die left on the tape may range from 35 mm (very large) to 0.1 mm square (very small).

The crystal measures 5 mm square.

The maze is made up of a 16 by 16 grid of cells, each 180 mm square with walls 50 mm high.

The Battles are played out on maps, overlaid with a grid of 35 mm x 35 mm squares.