User @Tim Pederick suggests the word “net”, which mathematicians will recognize. For the general public, it's difficult to find a single word to describe the "unfolded cube" in the picture.
A "scan" is not quite correct, because we use that word to mean when a scanner takes a flat picture, or a 3D representation of something.
Here are a few possibilities:
Multiview drawing
In the context of mechanical engineering, when someone creates an engineering drawing ("blueprint"), a layout of multiple views together might be called a multiview drawing (MIT Open Courseware), like this:
![engineering drawing](https://cdn.statically.io/img/i.sstatic.net/khLxH.png)
The difference here is that you have modified the object (by unfolding it), so multiview drawing
is close, but not quite right.
Diagram
The word diagram (as opposed to picture) carries the meaning that something has been changed. A diagram can be a simplified version of something.
A schematic representation
A similar word is a "schematic" (noun) or a "schematic representation" or a "schematic drawing" or a "schematic diagram". This emphasizes that the drawing is not meant to be exactly like reality, but that it is supposed to help explain how something works.
Electrical engineers use schematic drawings to help understand circuits, but their drawings are not usually arranged in the exact same way that the physical components are laid out.
Simply an unfolded view
Your question used the word “unfolded” which is pretty descriptive. How about simply an “unfolded view“.
This is straightforward(Definition) and clear — the best kind of writing!