A poem made up of fourteen lines. An English sonnet (sometimes called a Shakespearean sonnet) is a variation on the sonnet form traditionally made up of three quatrains and a couplet,  which usually follow the rhyme scheme ABAB, CDCD, EFEF, GG. An Italian sonnet (sometimes called a Petrarchan sonnet) is made up of an octave and a sestet, which usually follow the rhyme scheme ABBAABBA, CDECDE or CDCDCD.