Final answer:
The title 'To Kill a Mockingbird' symbolizes social injustice and the destruction of innocence, as mockingbirds in the story represent innocence and harmlessness.
Step-by-step explanation:
The title To Kill a Mockingbird symbolizes the themes of innocence and moral integrity. In the novel, mockingbirds represent innocence and goodness, and the act of killing a mockingbird stands for the unjust harm inflicted upon those who are innocent and do not harm others. This symbolizes the destruction of innocence and points directly to social injustice, particularly in the context of racial prejudice and the loss of innocence faced by the characters, especially Tom Robinson and Boo Radley.