Senryu

A senryu is a non-rhyming three-line 17-syllable poem, very similar to a haiku. The difference between a haiku and a senryu is that a senryu is about human foibles or characteristics of life and a haiku is traditionally about the seasons or nature. The first line of a senryu has five syllables, the second line has seven syllables, and the third line has five syllables.