oscillator

oskillaattori A tuned electronic circuit used to generate a continuous output waveform.
An instrument for measuring rigidity by the torsional oscillations of a weighted wire.
puhekieltä A pattern that returns to its original state, in the same orientation and position, after a finite number of generations.
2010, Andrew Adamatzky, Game of Life Cellular Automata (page 126)

Synthesis of spaceship flotillas is even more complicated than synthesis of oscillators, since spaceships are like oscillators that move(..)