Wikipedia
Petrarchan sonnet
The Petrarchan sonnet is a sonnet form not developed by Petrarch himself, but rather by a string of Renaissance poets. Because of the structure of Italian, the rhyme scheme of the Petrarchan sonnet is more easily fulfilled in that language than in English. The original Italian sonnet form divides the poem's 14 lines into two parts, the first part being an octave and the second being a sestet.
Usage examples of "petrarchan sonnet".
The fourth was a perfectly good Petrarchan sonnet reviling the current administration and the party of which Len was an assenting member.