Question

what does hanging of the Albatross round the Marina neck signifies

Answer 1

it signifies that instead of the holy cross on which the Christ was hung and which the Christians usually wear around their necks , the sin of killing a albatross will remain with the Marriner all the time as a remainder of doing something wrong.

Answer 2

The albatross  was hung around the mariner's  neck  to remind him of his mistake. It was to make him realise the horror  of his act of killing of Albatross without any reason. When  the mariner faced trouble after the death of the death of the Albatross , the crew was convinced that its killing was a sin. Thus, they punished the mariner.