Noun
matrioshka (plural matrioshkas or matrioshki)
Alternative form of matryoshka
Following the lead of Robert Bradbury, who promotes astronomical-scale, deep-layered "Matrioshka" or M-brains, Harris is attracted to mathematical solutions. Source: Internet
For example, Matrioshka brains extract energy for purposes of computation; Shkadov thrusters extract energy for purposes of propulsion. Source: Internet