pi-heptomino

pi-heptomino (plural pi-heptominoes)

1. (cellular automata) A particular symmetric seven-cell methuselah in Conway's Game of Life.
   • 1993 March 16, David Bell, “Life program (part 14/18)”, in comp.theory.cell-automata‎ (Usenet):

     A growing spaceship which uses the pi-heptomino.

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

     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.

   • 2005 February 23, Dave Greene, “exist glider gun able of reconstruction in Life?”, 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;