A poetic structure born on July 2002.
The general idea is to write a poem consisting of three four-lined paragraphs, where every three consequtive lines rhyme.
The result is a refreshingly new method to write poems instead of the boring two-lined rhyming. In a way, it's like a waltz.
The name is derived from the Hebrew words 'treisar' (twelve) and 'shir' (song).
It is much more difficult to write one than to write a Hamshir, but also much more fun.