A Netplan is a type of planet that has a negative size and dimensionality. Netplans are contained by Protoverses, null-sized structures.
Netplans share many similarities with normal planets, in that they usually host life, can be terrestrial or gaseous, etc. However, the similarities end there, with netplans orbiting negative moons, and negative suns orbiting a netplan.
Instead of atoms, netplans are made up of Verseunis, and are contained by a Protoverse instead of a galaxy or an universe.
Netplans aren't the most stable structures either, as they need naturally generated forcefields which stops them from imploding. For example, in the infobox's image we can see a netplan similar to Earth appearance-wise being surrounded by a purple forcefield.