I found this illustration in the Wikimedia Commons “Category: Radicals” collection – it stood out from the other diagrams and models. Maybe because it looks a little like a simple diagram of a space station or SkyLab.
The black parts (the hexagons) are carbon, and the white parts (the rods) are hydrogen. The “ball” in the name refers to the kind of diagram this is; a “spacefill” model looks a little more like an inflatable, but maybe shows how the atoms press their electron shells into one another a little better.
Bisphenalenyl — sometimes written as “bis(phenalenyl)” — is a “non-Kekulé molecule,” a kind of hydrocarbon that has “two or more formal charges or radical centers” and can conduct electricity or magnetism – but tend to fall apart at room temperature. Hydrocarbons are those organic molecules that don’t have oxygen but kind of want it so they burn easily, like gasoline or lighter fluid, although they also make up common plastics like polystyrene.