Just a thought:
Isn't that logo a bit weird? One proton but it looks like two electrons, and what's the extra layer around the proton?
That is neither a Proton ion or a valid atom.
I guess graphically it looks OK, but it doesn't make much sense IMO.
Edit:
It could with some leniency look like a Hydrogen anion (H-).
https://en.wikipedia.org/wiki/Hydrogen_anion
