T-tetromino

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T-tetromino
x = 3, y = 2, rule = B3/S23 3o$bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
Pattern type Miscellaneous
Number of cells 4
Bounding box 3×2
Discovered by John Conway
Year of discovery 1970

T-tetromino is one of the five tetrominoes. It is a common predecessor of the traffic light, and when paired with another T-tetromino it can become a pre-pulsar.

It is the daughter of the T-pentomino.

In other rules

The T-tetromino exhibits interesting behaviour in other life-like cellular automata. It is a c/4 orthogonal spaceship in 32 totalistic rules, B345/S126 to B345678/S12678, with the tip of the T being the trailing edge; it is also a c/4 orthonal spaceship in various isotropic non-totalistic cellular automata, though it evolves differently.

In the non-totalistic automaton tlife, the T-tetromino is an extremely common c/5 orthogonal spaceship, with the tip of the T being the leading edge.

External links