Old Nellie

A reference to Eleanor Rawling. "Old Nellie" is the shorthand for genocide devices intended to clear evidence of time traveling criminals from universes created by time travel, utilizing protocols that create "the end of the world".

They used “Old Nellie” on societies that detected them, including the original Terra (and the entirety of the first universe).

Also, "Old Nellie" devices were used to commit genocide against non-human aliens, throughout the universe, across various derivative timelines. And they were also used to eradicate all life from many universes, so that only robots loyal to time traveling criminals, and / or time traveling criminals themselves, would inhabit those universes.

They committed complete genocide against all life in nonillions of universes.