noun
5-7-5 syllable pattern
Refers to the metrical form of haiku, senryū, and similar verse, consisting of three phrases with 5, 7, and 5 morae respectively.
俳句は五七五の十七音で作られます。
Haiku are composed in seventeen syllables in a 5-7-5 pattern.
この川柳は五七五のリズムが心地よい。
This senryū has a pleasant 5-7-5 rhythm.