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I just call it a box or brick or block
12 ways, including those with rows and column numbers swapped.
It is called a cuboid, and some just call it a rectangular box.
a square or rectangular are the first things that came to my mind
Rectangular is an adjective, not a noun so there is no such thing as a rectangular. You an have a rectangular lamina, a rectangular pyramid, a rectangular prism, a rectangular antiprism and they all have different solid shapes.