Ships' pronouns are a set of four-letter pronouns used to refer to ships, boats, and other vessels. They are commonly used in nautical contexts, such as when referring to a ship's crew or when giving directions on the water. The pronouns are 'SHE, ' 'her, ' 'hers, ' and 'herself.' They are used to refer to ships as if they were female, and are thought to have originated from the idea that ships were seen as female figures, often with a motherly role.