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|Number of cells||13|
|Discovered by||Achim Flammenkamp|
|Year of discovery||1988|
Jam was found by Achim Flammenkamp in 1988, but not widely known about until its independent discovery (and naming) by Dean Hickerson in September 1989. In terms of its 7×7 bounding box it ties with trice tongs as the smallest period 3 oscillator, though caterer has fewer cells. It is also about the seventeenth most common naturally-occurring oscillator, being slightly less common than the blocker.
- Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.