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 the 5-7-5 pattern. Although the word ""on"" is sometimes translated as "syllable", one "on" is counted for a short syllable, two for an elongated vowel or doubled consonant, and one for an "n" at the end of a syllable. Thus, the word "haibun", though counted as two syllables in English, is counted as four "on" in Japanese (ha-i-bu-n); and the word ""on"" itself, which English-speakers would view as a single syllable, comprises two "on": the short vowel o and the . This is illustrated by the Issa haiku below, which contains 17 "on" but only 15 syllables. Conversely, some sounds,