Final answer:
The 'shipwrecked brother' often symbolizes isolation, despair, and the struggle for survival, reflecting a deep sense of being lost or adrift amidst life's adversities.
Step-by-step explanation:
The image of the "shipwrecked brother" in poetry often represents broader themes of isolation, despair, and the human condition. It can symbolize how a person feels cut off from society or support, struggling to survive against overwhelming odds. This metaphor speaks to a deep sense of being lost or adrift in life's challenges, resembling a dire situation like a shipwreck where one clings to the hope of rescue or relief. When considering larger implications, it may also touch upon themes of existential crisis or the search for meaning amidst adversity.