Dodecasyllable
Dodecasyllable verse (in Italian dodecasillabo) is a kind of verse used mostly in Italian poetry, although also used in poetry of the Southern Slavs (for example Milan Rakić). Each verse has exactly twelve syllables (and the literal meaning of the word is just "of twelve syllables").
Source: adapted by the editor from Wikipedia, the free encyclopedia; from the article "Dodecasyllable". Image Credit.