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|Oscillator type||Muttering moat|
|Number of cells||18|
|Discovered by||Rich Schroeppel|
|Year of discovery||1970|
Cuphook is a period-3 oscillator that was found by Rich Schroeppel in October 1970. It is one of only three essentially different period 3 oscillators with only three cells in the rotor. The others are 1-2-3 and stillater.
- Robert Wainwright (March 1971). "Lifeline Volume 1".
- 18P3.21 at Heinrich Koenig's Game of Life Object Catalogs