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x = 2, y = 3, rule = B3/S23 o$o$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
Pattern type Miscellaneous
Number of cells 4
Bounding box 2×3
Discovered by Unknown
Year of discovery Unknown

Tail (sometimes referred to as L or J) is a tetromino and predecessor of the beehive. It can often be attached to still lifes to create a larger still life (eg. tub with tail, beehive with tail). Even more important are the ways in which it may be attached to a marginally stable object of any kind to obtain overall stability while suppresing (or possibly exploiting) its own spark. The simplest such example is eater 1, in which a tail and a pre-block mutually stabilize one another. A tail can also stabilize one end of a fuse (e.g. as in eg. fuse with two tails).

See also