What term describes the change in tone or perspective within a sonnet?

Explanation

The term 'Volta' refers to the turn or shift in tone, argument, or meaning in a sonnet, often marking a change between the octave and the sestet in Petrarchan sonnets or before the final couplet in Shakespearean sonnets. Octave denotes the first eight lines, Iambic Pentameter is a metrical pattern, and Petrarchan is a type of sonnet.