Square? a cube has 6 sides each are squares.
A Cube
a cube
You can make many such shapes. One of them is the cube.
a bigger cube
Cube
cube
If there is a 2x2x2 cube and you make it a 4x4x4 cube it goes from 8 to 64, so 8 times.
a rectangle
Think of a shape being made of putty. You are allowed to flatten it or make corners but you cannot create or remove any holes. In this context, a sphere and a cube are the same - you can make a sphere into a cube by flattening some faces. But a sphere cannot be re-moulded into a torus (doughnut). This is topology and the order of a shape is the number of "holes" in it.
You trace it or fill in the inside to make a shape or symbol of some sort easily and quickly, and with no artistic ability.
The answer is a Cube. Please make sure this is the answer because I might be wrong.
people want their ice cubes to last longer, so if you make ice cubes in a different shape so they melt slower, people will be happier.