A sestet's the name given to the second division of an Italian sonnet (as opposed to an English or Spenserian Sonnet), which must consist of an octave, of eight lines, succeeded by a sestet, of six lines. The first documented user of this poetical form was the Italian poet, Petrarch. In the usual course the rhymes are arranged abc abc, but this isn't necessary. Early Italian sonnets, and in particular those of Dante, often close with the rhyme-arrangement abc cba; but in languages where the sono… (More on Sestet)