In contrast to English verse typically characterized by 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 (定型 fixed form) haiku continue to use the 5-7-5 pattern while jiyuritsu (自由律 free form) haiku do not.[citation needed] One of the examples below illustrates that traditional haiku masters were not always constrained by the 5-7-5 pattern.