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It is the flattened form of a three-dimensional figure.
Its called a net.
A pattern, also known as a net answer 2: An orthographic projection
If you had a 3D shape made out of paper, that was all folded and taped together, and you pulled the tape off and layed the figure out flat, then you would get the net of the three dimensional solid.
A net is a two-dimensional figure which can be folded into a three-dimensional figure. It's a little difficult to describe in words . . . To make a regular triangular prism, start with a rectangle, and divide it into three equal (narrow) rectangular strips. on the two ends of one of these strips, make equilateral triangles.