Haiku such as "kyo" () may look like two syllables to English speakers but are in fact a single "on" (as well as a single syllable) in Japanese. In 1973, the Haiku Society of America noted that the norm for writers of haiku in English was to use 17 syllables, but they also noted a trend toward shorter haiku. Shorter haiku are very much more common in 21st century English haiku writing. Some translators of Japanese poetry have noted that about 12 syllables in English approximate the duration of 17 Japanese "on". Also in translations four lines is more appropriate for
Haiku in English four lines (sometimes known as "haiqua") or longer have been written, some of them "vertical haiku" with only a word or two per line. These poems mimic the vertical printed form of Japanese haiku. The translator Nobuyuki Yuasa considered four lines more appropriate in his translations, being closest to the natural conversational rhythm of the colloquial language of haiku, also that three lines did not carry the weight of hokku and found it impossible to use 'three lines' consistently for his translations. The contemporary poet John Martone has written a vast number of vertical haiku. Haiku have also appeared in