L-tetromino

The  is a 4-polyomino. The is chiral. As one-sided polyominos the two enantiomorphs are called the L-tetromino (resembles the Latin letter L with the long leg pointing upwards) and the J-tetromino (resembles the Latin letter J with the long leg pointing upwards). The term "" is used generally to refer to the free polyomino encompassing both enantiomorphs.

It may be considered as an 6-sided figure with varying side lengths, 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 L-tetracube. Both the enantiomorphs of the yield the same non-chiral tetracube. It has on L-tetromino face and one J-tetromino face, and is the only tetracube with faces.

The is the second smallest of a general class of polyominos, the L-polyominos, the smallest being the L-tromino.