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|Oscillator type||Muttering moat|
|Number of cells||16|
|Discovered by||Robert Kraus|
|Year of discovery||1971|
Quad (or barberpole intersection) is a period-2 oscillator and muttering moat that was found in April 1971 by Robert Kraus. It has the same rotor as the clock. It and mold are the only flippers that fit inside a 6×6 bounding box; however, mold is period 4.
- Eric Weisstein. "Quad". Eric Weisstein's Treasure Trove of Life. Retrieved on May 1, 2009.
- 16P2.19 at Heinrich Koenig's Game of Life Object Catalogs