Any small "
seed" pattern in
Conway's Life that does not
stabilize for a very long time. The term is not used to
describe objects that are known to grow
forever, and was originally
defined as a
pattern having a
population of at most 10 and a
Life-span of at least 100. Examples include the
acorn,
bunnies,
pi heptomino,
r-pentomino,
rabbits, and
thunderbird, as well as
the unnamed patterns below. The first becomes the
r-pentomino after two
ticks. The second stabilizes after 608
generations into six
blocks,
12
blinkers, and one
loaf. The third lasts 1108
ticks, and the fourth
lasts 148 ticks, after forming three
blocks, a
ship, and two
gliders.
.ooo......ooo.........o...........o..
o............o...................ooo.
o............oo......oo.ooo......o.oo
Source: Life Lexicon by Stephen Silver
url: http://www.cs.jhu.edu/~callahan/lexiconf.htm
and Eric Weissten's Treasure Trove