A tétromino , also named tétramino or tétrimino , is a geometrical Figure made up of four Carré S, each one having at least a side completely divided with another. It belongs to the class of the Polyomino S, just like the Domino S and the Pentamino S.

Sometimes, this term means aggregate of Cube S being touched by a complete face.

The tétrominos are used in the Video game Tetris.

By regarding the Rotation S in the plan as equivalent, there are seven possible forms:

• I (also called “stick”, “ordinary” or “long”): Four squares according to a line
• O (also called “square”, “package” or “block”): Four squares forming a méta-square 2×2
• T : A line of three squares with a square under the center.
• L : A line of three squares with a square under the left side.
• J (also called “L reversed” or “gamma”): A line of three squares with a square under the right-sided. This part is a L reflected, but cannot be turned to form a L in the plan; it is an example of the Chiralité.
• S : A méta-square 2×2 whose higher line is slipped of a step towards the line.
• Z : A méta-square 2×2 whose higher line is slipped of a step towards the left. The topic of symmetry for L and J applies here also.

While working in 3D, three other parts appear:

• left Screw.
• right Screw.
• Branch.

However, handling 3D means that rotation is allowed. Consequently, J and L, just like S and Z are equivalent.

Certain people refer to the parts by the color given in the play Tetris. However, it varies according to the establishments. For example, several versions of antan used the red for I.

To take note that The New Tetris opposite colors of L and J, as well as S and Z.

See too

Related articles

• Tetris
• Domino
• Pentamino
• Polyomino