pi-heptomino

plural pi-heptominoes

1. cellular automataA particular symmetric seven-cell methuselah in Conway's Game of Life.

   A growing spaceship which uses the pi-heptomino.

   1993 March 16, David Bell, “Life program (part 14/18)”, in comp.theory.cell-automata (Usenet)

   2 more examples

   It does include a pseudo-spaceship based on the Pi-heptomino (pseudo because it needs some classic spaceships in front, and so the middle gets longer and longer.

   1995 March 30, John Harper, “Life - has anybody found....”, in comp.theory.cell-automata (Usenet)

   1) gliders on paths *adjacent* to the six annihilating paths produce a pi-heptomino and consequent large explosion -- and there's no way to place blocks on nearby lanes to catch those gliders, because they'd interact messily with gliders on some of the original six glider paths;

   2005 February 23, Dave Greene, “exist glider gun able of reconstruction in Life?”, in comp.theory.cell-automata (Usenet)