Haiku (俳句, ) is a type of short form poetry that originated in Japan, and can be traced back from the influence of traditional Chinese poetry. Traditional Japanese haiku consist of three phrases composed of 17 morae (called on in Japanese) in a 5, 7, 5 pattern; that include a kireji, or "cutting word"; and a kigo, or seasonal reference. However, haiku by classical Japanese poets, such as Matsuo Bashō, also deviate from the 17-on pattern and sometimes do not contain a kireji. Similar poems that do not adhere to these rules are generally classified as senryū.
https://en.wikipedia.org/wiki/Haiku
Haiku (俳句, ) is a type of short form poetry that originated in Japan, and can be traced back from the influence of traditional Chinese poetry. Traditional Japanese haiku consist of three phrases composed of 17 morae (called on in Japanese) in a 5, 7, 5 pattern; that include a kireji, or "cutting word"; and a kigo, or seasonal reference. However, haiku by classical Japanese poets, such as Matsuo Bashō, also deviate from the 17-on pattern and sometimes do not contain a kireji. Similar poems that do not adhere to these rules are generally classified as senryū.
