The original Italian or Petrarchan sonnet form divides the poem's 14 lines into two parts, the first part being an octet and the second being a sestet. The Italian sonnet is made up of two sections, grouped by different rhyming sounds. The first 8 lines is called the octave The last 6 lines are known as the sestet and can have two or three rhyming sounds which can be arranged in a number of ways.