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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 is the only flipper that fits inside a 6 × 6 bounding box.
- Eric Weisstein. "Quad". Eric Weisstein's Treasure Trove of Life. Retrieved on May 1, 2009.
- Quad at the Life Lexicon
- 16P2.19 at Heinrich Koenig's Game of Life Object Catalogs