Haiku

A Haiku is a Japanese poem consisting of seventeen syllables, in three lines of five, seven, and five, traditionally evoking images of the natural world.

History
In the winter of 2002, Paige Matthews wrote a vanquishing haiku instead of a vanquishing spell, due to her inability to rhyme. Much to her sisters' surprise, the haiku worked and the demon Ludlow was vanquished.