Poetry Japanese formal poetry (which was generally referred to as "waka"), and was used more heavily to explore personal rather than public themes. By the tenth century, tanka had become the dominant form of Japanese poetry, to the point where the originally general term "waka" ("Japanese poetry") came to be used exclusively for tanka. Tanka are still widely written today. Haiku is a popular form of unrhymed Japanese poetry, which evolved in the 17th century from the "hokku", or opening verse of a renku. Generally written in a single vertical line, the haiku contains three sections totalling 17 "onji", structured in
Mora (linguistics) moraic system of writing. For example, in the two-syllable word "mōra", the "ō" is a long vowel and counts as two morae. The word is written in three symbols, モーラ, corresponding here to , each containing one mora. Such scholars also argue that the 5/7/5 pattern of the haiku in modern Japanese is of morae rather than syllables. The Japanese syllable-final "n" is also said to be moraic, as is the first part of a geminate consonant. For example, the Japanese name for "Japan", 日本, has two different pronunciations, one with three morae ("Nihon") and one with four ("Nippon"). In