Italian sestet

The Italian sestet is a stanza form used in English poetry.

Form
The Italian sestet is a 6-line stanza (sestet) written in cross rhyme; that is, with a rhyme scheme of A-B-A-B-A-B. It can be in any meter, though iambic tetrameter and iambic pentameter are the most commonly used.

In sonnets
The Italian sestet is often used as the form for the last 6 lines (the "sestet") of a Petrarchan sonnet.