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Hatnotes are short notes placed at the top of an article (hence the name "hat"), normally to help readers locate a different article they might be looking for when they arrived at the article in which the hatnote is placed (this may happen because of redirects, because the article they are looking for uses a more specific, disambiguated title, or because its name is otherwise similar to that of the article with a hatnote). They accomplish this by providing links to the article in question or to a disambiguation page.
For more information about methods of disambiguating articles, see