[ibeff]

It's not a diagram or mock-up, it's a direct representation of the real thing for computer simulations, similar to CAD. The dimensions and shape of the components are accurate. And the author is calling it a logo because the picture is used to represent and advertise the software.

[mxfh]

It's a product diagram on a presentation slide. Hopefully meant to be read on handouts or proceedings.

A logo is the Sierra stylized text in the lower center.

And the two others in the slide's footer.

That Sandia might use, what was obviously intended as a diagram as a logo is a whole other thing but doesn't make it one.

As long as all representation of that thing are that big and readable one can assume they were not used as logos.

[InsideOutSanta]

The author of the post claims that the warhead-like design "is literally the logo for this particular software framework." I can't verify this claim, but other Sandia frameworks (e.g. Sierra) use similar, equally overdesigned logos, so it's plausible.