Life Lexicon
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:x66 (c/2 orthogonally, p4) Found by Hartmut Holzwart, July 1992. Half of this can be escorted by a HWSS. The name refers to the fact that every cell (live or dead) has at most 6 live neighbours (in contrast to spaceships based on LWSS, MWSS or HWSS). In fact this spaceship was found by a search with this restriction. 

	..O......
	OO.......
	O..OOO..O
	O....OOO.
	.OOO..OO.
	.........
	.OOO..OO.
	O....OOO.
	O..OOO..O
	OO.......
	..O......

:Xlife A popular freeware Life program that runs under the X Window System. The main Life code was written by Jon Bennett, and the X code by Chuck Silvers.

:X-pentomino Conway's name for the following pentomino, a traffic light predecessor. 

	.O.
	OOO
	.O.
Introduction | 1-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Bibliography