|View animated image|
|View static image|
|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.
Jam is about the seventeenth most common naturally-occurring oscillator in Achim Flammenkamp's census, being slightly less common than the blocker. On Catagolue, it is the second most common period 3 oscillator, being less common than the pulsar but more common than the candlefrobra on trans-block.
- Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
- Adam P. Goucher. "Census". Catagolue. Retrieved on October 27, 2018.
- 13P3.1 at Heinrich Koenig's Game of Life Object Catalogs