Haiku a phrase in the remaining 12 "on" (it may not be apparent from the English translation of the Issa that the first five "on" mean "Edo's rain"). In comparison with English verse typically characterized by syllabic meter, Japanese verse counts sound units known as ""on"" or morae. Traditional haiku consist of 17 "on", in three phrases of five, seven and five "on" respectively. Among contemporary poems "teikei" ( fixed form) haiku continue to use the 5-7-5 pattern while "jiyuritsu" ( free form) haiku do not. One of the examples below illustrates that traditional haiku masters were not always constrained by
Haiku matter. The loosening of traditional standards has resulted in the term "haiku" being applied to brief English-language poems such as "mathemaku" and other kinds of pseudohaiku. Some sources claim that this is justified by the blurring of definitional boundaries in Japan. Subsequent to Paul-Louis Couchoud’s popularisation of the form in France through his essays and translations, the next major haiku collection to appear there was the sequence of war poems by , "Cent visions de guerre" (1916). Later haiku by him were included among the work of the twelve published together in the "Nouvelle Revue Française" (No. 84, September 1920),