Petrarchan refers to a specific form of sonnet that originated from the works of the Italian poet Petrarch in the 14th century. This type of sonnet is characterized by its unique structure, typically consisting of 14 lines divided into an octave and a sestet, following the rhyme scheme ABBAABBA for the octave and various patterns such as CDCDCD or CDECDE for the sestet. Petrarchan sonnets often express themes of love, beauty, and nature, emphasizing the emotional depth of the poet's experience.