Skew tetromino

The  is a 4-polyomino. The is chiral. As one-sided polyominos the two enantiomorphs are called the S-tetromino (resembles the Latin letter S) and the Z-tetromino (resembles the Latin letter Z). The term "" is used generally to refer to the free polyomino encompassing both enantiomorphs.

It may be considered as an 8-sided figure with sides of lengths 2 and 1, or as a 10-sided figure with colinear edges. The latter is most common when considering tessellations involving the as it makes it equilateral.

Related polytopes
The prism of the is the skew tetracube. Both the enantiomorphs of the yield the same non-chiral tetracube. It has on S-tetromino face and one Z-tetromino face, and is the only tetracube with faces.