Telos, one of the Cybermen Tomb Worlds.
Tomb worlds were the thousands of planets across the galaxy that held Cyber-Tombs. The civilisations that developed on these worlds were actually "raw material" waiting to be processed through cyber-conversion. It was intended that every world would receive a galactic dehibernation signal that would awaken every Cyberman in the galaxy from their long sleep. (AUDIO: Kingdom of Silver)
Telos (TV: The Tomb of the Cybermen) was the Master Hibernation Unit. (AUDIO: Conversion, Telos) Other worlds included Cantus, (AUDIO: The Crystal of Cantus) Tasak (AUDIO: Kingdom of Silver) and the planet of Hedgewick's World of Wonders. (TV: Nightmare in Silver)
This concept and lore was adapted into the Necron faction by Games Workshop for their Warhammer 40k franchise.