I must admit to assuming that you are talking about the novel The Scarlet Letter, so I hope this is answering the correct question. One of the most famous images in the story is the actual scarlet letter "A" that Hester Prynne must wear due to the fact that she has been convicted of adultery. It stands for the type of stigma and ostracization that ocurred in the New England colonies of people like Anne Hathaway and those who were different or thought differently than the majority.
Another image might be that of Hester's embroidery, semi-forbidden by the Puritans but still used by the leaders of the colony in another hypocritical move or habit. These images act as symbols to point out to the reader the various things that the author is trying to get across.