computronium

The neutronium substance of Hades would therefore be computronium.

A significant percentage of the shells would be composed of nanoscale computers (see molecular-scale computronium).

In Orion's Arm Universe Project computronium is any form of matter which supports computation, including the human brain.

It is called "Computronium" in Charles Stross' Accelerando.

In Charles Stross and Cory Doctorow's book, Rapture of the Nerds, the Sun is surrounded by Dyson Spheres of computronium, which host the Singularity.

In the novel Accelerando by Charles Stross, a Dyson swarm (possibly a Dyson bubble) of computronium forms a massive matrioshka brain around the sun providing virtual space for trillions of uploaded human minds and corporate AI.

It is also possible that nucleons on the surface of neutron stars could form complex "molecules" which some have suggested might be used for computing purposes, creating a type of computronium based on femtotechnology which would be faster and denser than computronium based on nanotechnology.